Fact-checked by Grok 2 weeks ago

Notification LED

A notification LED is a small (LED) typically embedded in the front or area of smartphones, feature phones, and other mobile devices, designed to provide discreet visual alerts for events such as incoming calls, messages, emails, low , or charging status by blinking or steadily glowing in specific colors. These LEDs, often RGB-capable for multicolored output, allow users to recognize notification types at a glance without activating the screen, conserving life and enabling visibility from a distance. Common color codes include blue for general notifications or pulsing during power states, for charging or unread alerts, and for full charge completion, with app-specific customizations possible on supported devices. The feature originated in early phones from the , evolving through the era as a battery-efficient method, and saw peak adoption in early smartphones before declining in flagships due to design changes like slimmer bezels and notches. As of 2025, notification LEDs persist in some mid-range phones from manufacturers like and , valued for by reducing the need to unlock devices—users check phones around 150 times daily on average—while providing brighter feedback than always-on display alternatives.

Definition and Functionality

Purpose and Benefits

A notification LED is a small (LED), typically RGB-capable or monochrome, positioned on the front or edge of devices such as smartphones and phones, designed to blink, pulse, or glow in response to various alerts. This feature provides a subtle visual indicator without requiring the device to activate its main display or emit sound. The primary purposes of a notification LED include alerting users to incoming or pending events, such as missed calls, text messages (), app notifications from services like or , low levels, and charging status. For instance, it may emit a steady blink for missed calls, an intermittent for new messages, or color-coded signals during charging—such as for low or ongoing charge, green for full charge, and blue for other app-specific alerts. These functions enable users to stay informed about device activity at a glance, particularly in silent or do-not-disturb modes. Key benefits of the notification LED encompass its , as the LED consumes far less power than illuminating the full screen or activating an , thereby preserving battery life during idle periods. It delivers discreet, non-intrusive notifications that are visible from a distance, allowing users to detect alerts without interacting with the device or disrupting their surroundings. Additionally, it enhances for users with hearing impairments by providing a reliable visual cue for sounds they may not hear, such as incoming calls or alarms, promoting greater independence and safety.

Operational Mechanism

The notification LED operates through a of dedicated and software within the smartphone's operating , enabling low-power visual signaling for incoming events. At the level, the notification LED is usually implemented as a compact tri-color RGB LED or a simpler variant positioned in the device's front near the . This LED is powered directly from the phone's via the power management (PMIC), drawing minimal —typically in the range of 1-20 per color depending on brightness and —to ensure negligible impact on overall life. The LED is driven by a dedicated controller or the main SoC's GPIO pins, which modulate the output using (PWM) techniques to achieve blinking patterns by varying the on/off durations for each color . On the software side, the mechanism is triggered when the operating system receives a notification intent from an app or system event, such as an incoming call or message. In , this is handled primarily through the NotificationManager service, where developers or the system can invoke the setLights method on a NotificationCompat.Builder to specify the LED color (via ARGB value), on duration (in milliseconds), and off duration (in milliseconds), creating a repeating blink cycle until the notification is acknowledged or times out. For 8.0 () and later, LED behavior is managed at the notification channel level, allowing users to enable or customize lights per category in system settings, while the OS checks user preferences before activating the driver. In older iOS models supporting equivalent features (such as LED flash alerts introduced in ), a similar process uses the rear camera flash LED, controlled via accessibility settings to pulse in response to events when the device is locked or silent. The activation sequence begins with the OS intercepting the event, validating against user-configured settings (e.g., enabling LED notifications globally or per type), and then signaling the LED driver IC to apply the specified color and pattern—commonly for calls, for messages, or white for general alerts—persisting for a configurable timeout period of 10-30 minutes or until dismissed. Integration with other device features ensures contextual behavior; for instance, the LED pauses during active calls via linkage to the , which detects when the phone is held to the ear, and is suppressed entirely in Do Not Disturb mode to respect user silence preferences. Regarding power efficiency, the notification LED's pulsing operation consumes significantly less than alternatives like screen wake-ups, with estimates indicating less than 0.1% drain over an hour of continuous blinking on a typical 3000 mAh , due to its low draw and intermittent . This prioritizes always-on visibility without substantial resource overhead, leveraging the LED's direct connection and PWM for precise, efficient control.

History and Adoption

Early Implementations

The origins of notification LEDs trace back to the early in feature phones and personal digital assistants (PDAs), where they served as compact, low-power visual indicators for basic alerts like incoming calls or messages. One of the earliest notable implementations appeared in devices like the SCP-5500, released in 2004, which featured a customizable notification light supporting up to six colors for different , marking a shift toward more versatile signaling in clamshell phones. Similarly, the (2004) included an external LED indicator that flashed to denote connectivity and charging status, evolving from simple power lights to rudimentary notification functions in flip phone designs. These early LEDs were driven by the demand for battery-efficient alerts in increasingly portable devices, allowing users to receive signals without activating the screen or relying solely on audible tones. In parallel, devices pioneered pulsing LED notifications during this period, providing discreet visual cues for and message arrivals in enterprise-focused PDAs. Earlier models like the 850, launched in 1999, featured a basic LED for unread message alerts. The Pearl 8100, launched in 2006, integrated a multi-color notification LED in the top-right corner, enabling basic customization for alerts such as new messages or , which enhanced usability in silent environments. This adoption was further influenced by growing emphasis on accessibility in the , as visual indicators like LEDs complemented vibrating alerts to support users with hearing impairments, aligning with emerging standards for inclusive mobile technology. Regulatory developments, such as the U.S. Access Board’s Section 508 standards finalized in 2000, encouraged accessible features in electronic devices, indirectly promoting visual signaling in . Early smartphone platforms extended this functionality, with Windows Mobile devices like the HTC Wizard (2005) incorporating LED indicators primarily for status and camera flash, though limited to basic on/off signaling. The debut of in 2008 with the (also known as the T-Mobile G1) marked a key milestone, featuring a dedicated notification LED near the earpiece that blinked to signal new messages or events, transitioning toward more standardized integration in smartphones. However, these initial versions were constrained by hardware limitations, typically offering only or single-color output with fixed blinking patterns, and lacking app-specific controls due to the era's rudimentary software ecosystems.

Peak Usage in Smartphones

During the , notification LEDs reached their zenith in popularity within the ecosystem, becoming a ubiquitous feature in smartphones from 2010 to 2018, offering users a subtle, at-a-glance way to monitor alerts without unlocking the device. integrated RGB notification LEDs into its Galaxy S series up to the Galaxy S9 released in 2018, enabling multi-app differentiation through customizable colors for various notifications such as messages, calls, and system events. Similarly, HTC's One series throughout the decade featured a prominent front-facing LED, positioned above the display for enhanced visibility in pocket or bag use, which allowed for distinct blinking patterns to indicate different types of alerts. While adoption was more restrained on , Apple repurposed the rear camera flash as a notification light in models from the through the , providing a simple pulsing effect for incoming alerts starting with iOS updates in the early . maintained strong support for the feature in its Xperia lineup, including the XZ Premium in 2017, where the LED supported multiple colors for app-specific notifications. also embraced it in devices up to the in 2018, integrating the LED into the alert system for quick status checks. These implementations were facilitated by the era's trends, such as larger bezels that accommodated the without compromising . Feature enhancements during this period elevated the utility of notification LEDs, with many devices employing RGB setups capable of displaying up to 16 million colors to encode detailed information like origins or priority levels. Some models integrated the LED with advanced features, such as VoLTE, to specific patterns for incoming voice calls over connections. By 2015, the feature had permeated mid-range phones, appearing in a majority of models to meet consumer demand for practical battery-saving notifications. Tech reviews from 2012 to 2018 frequently lauded the LED's convenience, highlighting its role in reducing screen wake-ups and improving in daily scenarios like meetings or sleep. The final major implementations of traditional notification LEDs appeared in select flagships up to 2022, including Sony's Xperia 1 IV, which retained the multi-color front LED for alerts. These devices marked the tail end of widespread adoption before manufacturers shifted priorities.

Customization Options

App-Specific Settings

In devices equipped with a notification LED, users configure app-specific settings through the system's notification management interface, typically accessed via Settings > Notifications > App notifications. Here, individual s such as or can be selected, and options like notification importance can be set to high priority, enabling the LED to upon receiving alerts from that app if the hardware supports it. This process relies on 's notification channels, introduced in Android 8.0, which allow developers to categorize notifications (e.g., messages versus updates) and users to toggle LED triggering per category without affecting the entire app. BlackBerry OS offered native LED control for certain system events through the device's , but comprehensive per-app customization typically required third-party applications such as BeBuzz or HUB++. On devices, the rear camera LED for alerts is limited to system-wide activation for built-in apps like or Messages, configured via Settings > > Audio/Visual > LED for Alerts; per-app customization is not natively available. For greater granularity, Android's system supports assigning LED activation per app category, such as distinguishing notifications from , by adjusting channel importance levels—high-importance channels prioritize LED use over low ones. In cases of multiple simultaneous notifications, the OS employs priority queuing, where higher-priority alerts (e.g., from starred contacts) take precedence, potentially cycling the LED through active notifications to indicate ongoing activity. Manufacturer variations, like Samsung's , enhance this by allowing app grouping in notification settings for improved notification management. Third-party apps, such as Light Flow (introduced in the early 2010s), extend native capabilities on by providing finer per-app LED control, including toggling activation for over 600 apps and handling priority queuing; these require granting notification access permission to function. Limitations include inconsistent native support across apps, as not all implement notification channels that trigger the LED, and functionality varies by manufacturer— for instance, some devices lack LEDs altogether, rendering settings ineffective.

Color and Pattern Customization

Notification LEDs on smartphones, particularly those equipped with RGB capabilities, enable users to customize colors for distinguishing between different types of alerts, with many devices supporting over 16 distinct hues through , , and blue light combinations. For instance, a blue light might indicate a notification, while could signal an incoming call or low battery status. In contrast, monochrome LEDs are restricted to simple on/off pulsing without color variation, limiting their utility for nuanced signaling. Pattern customization further enhances distinguishability by adjusting blink rates and durations to convey priority levels. Slow blinking, such as extended intervals between pulses, is often used for low-priority notifications, whereas fast blinking—perceived as more urgent and effective by users—alerts to high-priority events like missed calls. Typical cycles include various on/off durations, with options for steady illumination or advanced Morse-like codes in supported applications. Stock implementations offer limited , primarily allowing users to enable or disable the LED without color or pattern adjustments. Third-party apps expand these options significantly; for example, LED Blinker Notifications permits per-app color selection, adjustable blink speeds, and pattern variations, including support for gradients and animations. Similarly, Light Manager enables of LED colors, frequencies, and durations for specific apps or events. Manufacturer-specific features provide tailored presets prior to hardware deprecation around 2019. devices, such as those in the S series up to the S9, featured predefined colors like for device power states, for charging or notifications, and green for full charge, with basic pulsing patterns. Sony's Xperia series, including models like the , utilized apps such as Discolight or official APIs for individual RGB control of the illumination bar, allowing custom colors and synchronized pulse patterns. Advanced features in customization apps include synchronization of LED patterns with device vibrations for multimodal alerts and adjustable timeouts ranging from 5 to 60 minutes to control how long the light persists after a notification. These options, often requiring notification access permissions, help users tailor the LED to personal preferences while integrating with app-specific triggers.

Decline and Alternatives

Reasons for Deprecation

The shift toward bezel-less screen designs in flagship smartphones, beginning prominently with models like the in 2017 and the Galaxy S10 in 2019, significantly reduced available space on the front fascia for dedicated notification LEDs, as manufacturers prioritized maximizing display area to meet consumer demand for immersive viewing experiences. These designs eliminated the traditional placement for front-facing LEDs, forcing trade-offs in hardware features to achieve slimmer profiles and higher screen-to-body ratios exceeding 90%. Additionally, the pursuit of water-resistant certifications, such as IP68 ratings standard in flagships since around 2016, introduced integration challenges for LEDs, requiring complex sealing to prevent water ingress while maintaining functionality, which increased design complexity without proportional benefits. Technological advancements in display technology further diminished the necessity of separate notification hardware, with the rise of and panels enabling efficient (AOD) features that could render persistent notifications directly on the screen. The Moto X introduced an early form of always-on notifications with Active Display in 2013, while Samsung's Galaxy S7 (2016) popularized full AOD on consumer smartphones, allowing low-power visibility of time, date, and alerts without full screen activation. By 2018, AOD became widespread in Android flagships like the , leveraging the per-pixel lighting control of to minimize power draw—typically under 1% additional battery usage per hour—compared to the negligible but dedicated consumption of a standalone LED. This integration rendered physical LEDs redundant, as screen-based notifications offered greater flexibility for detailed alerts without extra components. From a practical standpoint, notification LEDs provided only marginal savings relative to AOD—often less than 0.1% per notification cycle—while adding to expenses in increasingly slim devices, where even small hardware elements contributed to overall production costs. While some users miss notification LEDs, others have adapted to screen-based alternatives, as discussed in tech reviews and forums. Major manufacturers actively phased out notification LEDs in response to these trends, with omitting them starting from the Galaxy S10 lineup in 2019 to streamline the bezel-less aesthetic, a decision echoed across their subsequent models. Apple never widely incorporated front-facing notification LEDs in iPhones, relying instead on screen and sounds from the outset. Sony removed the feature starting with the Xperia 1 V in 2023; LG's last , the V60 (2020), included it, but the company exited the smartphone market in 2021. As of 2025, notification LEDs are rare in new releases but appear in some and niche models from brands like and , though no precise adoption rate is available. On the environmental and user fronts, eliminating dedicated LEDs contributed to reduced through simpler device architectures, avoiding components prone to failure over time, such as LED degradation or after prolonged use spanning several years. User reports frequently highlighted concerns, including dimming or inconsistent performance in older devices, further justifying the shift to more reliable integrated solutions.

Modern Replacement Technologies

With the deprecation of physical notification LEDs in most smartphones, manufacturers have shifted to screen-based technologies that leverage modern and displays for low-power visual alerts. One prominent replacement is the (AOD), a feature that keeps essential information like time, date, battery status, and notification icons visible on the without fully activating the device. first introduced AOD on its S7 and S7 edge smartphones in 2016, utilizing the energy-efficient properties of AMOLED panels to illuminate only specific pixels, resulting in minimal battery consumption—typically adding less than 1% drain over 24 hours under normal usage conditions. integrated a similar AOD capability into its lineup starting with the in 2018, evolving it to include dynamic elements like music controls and updates while maintaining low power draw through adaptive refresh rates. Building on AOD, edge lighting and animated notifications provide more engaging visual cues by utilizing the curved or full-screen edges of devices. Samsung's Edge Lighting, initially launched with the S6 edge in 2015 and refined in subsequent models from 2017 onward, pulses colorful light effects around the screen's perimeter or camera cutout upon receiving alerts, customizable by app and allowing for patterns that mimic LED behaviors without dedicated hardware. Apple's Dynamic Island, debuted on the in 2022, transforms the front camera pill-shaped cutout into an interactive notification hub that expands with haptic feedback and animations for calls, music, or messages, offering a seamless blend of visual and tactile alerts that enhance user interaction beyond simple color blinking. These features improve upon LEDs by supporting richer content like icons or live previews, though they may consume slightly more power during active pulses compared to a static LED. Additionally, brands like have introduced the Glyph interface, featuring rear LED strips for animated notifications on models such as the Phone (3a) Lite (2025), offering a hardware-based alternative to traditional front LEDs. For devices lacking native hardware, third-party software simulations replicate LED effects using available components. Apps such as LED Me Know, available since the early and updated for through 13, repurpose the screen's edge pixels or rear camera flash to display customizable blinking animations for incoming notifications, enabling LED-like persistence on models like the S21 series without physical lights. Complementary features include Ambient Display, which briefly wakes the screen to show notifications upon detection of motion or new alerts, and notification history introduced in in 2020, allowing users to review dismissed or missed alerts via a dedicated log for up to 24 hours. Additionally, integrations with wearables like smartwatches provide vibration-based notifications synced to the phone, reducing reliance on visual cues altogether while ensuring discreet alerts during meetings or sleep. These modern technologies offer distinct advantages over traditional LEDs, including greater through full-color icons, text previews, and animations rather than limited color coding, as well as superior in bright environments due to higher screen . However, they can incur higher power usage in non-optimized scenarios, though advancements in display tech have mitigated this to levels comparable to or better than LEDs in daily use. As of 2025, AOD and similar features are widely standard in flagship smartphones from major vendors like , , and Apple, reflecting widespread adoption driven by bezel-minimizing designs.

References

  1. [1]
    What do the notification light colours mean on my Samsung Galaxy ...
    Some Galaxy smartphones have notification LEDs which blink different colours to let you know about alerts on your phone.
  2. [2]
    Versus: For and against LED notification lights in phones
    Apr 5, 2019 · Are notification LED lights a thing of the past or yet another beloved feature of old that they are taking from us? In this joint editorial ...
  3. [3]
    A Brief History of Smartphone Notifications - WIRED
    Jun 26, 2019 · In a pre-internet world they existed as flags on mailboxes or blinking lights on answering machines. Then, in the 1990s and early 2000s, ...
  4. [4]
    Years Later, I Miss My Phone's Notification LED - How-To Geek
    Nov 11, 2024 · The notification LED replacement I settled on is a LED-like ring placed around the front-facing camera that lights up when you get a new notification.
  5. [5]
    Alerting devices / Deaf and Hard of Hearing - MN.gov
    Alerting devices use a loud tone, flashing lights or vibrations to alert people with hearing loss to various environmental sounds.
  6. [6]
    https://mn.gov/deaf-hard-of-hearing/assistive-technology/alerting-devices/index.jsp
  7. [7]
    battery life - Notification LED's generic power consumption
    May 2, 2014 · The power consumption isn't noticeable. Even a tiny watch battery can run a small LED for a few days continuously.Missing: RGB color
  8. [8]
    https://android.stackexchange.com/questions/68638/notification-leds-generic-power-consumption
  9. [9]
    Changing LED color for notifications - android - Stack Overflow
    May 29, 2011 · I came across this app called "Go SMS Pro", which, among other things, can set up notifications in different colors (blue, green, orange, pink and light blue).Controling Android's front led lightled notification in android API 23More results from stackoverflow.com
  10. [10]
    About notifications | Views - Android Developers
    A notification is a message that Android displays outside your app's UI to provide the user with reminders, communication from other people, or other timely ...
  11. [11]
    Notification LEDs Are A Dead Art - Pocketnow
    Apr 19, 2012 · It wasn't until 2004 that I experienced a fully-customizable notification light, in my Sanyo SCP-5500. Six colors were supported, and all were ...
  12. [12]
    [PDF] Motorola RAZR V3 Manual - The Informr
    When the connection is made, the. Bluetooth indicator а displays in the home screen, and the external. Bluetooth LED indicator flashes. Find the Feature. M ...
  13. [13]
    Full Specs for the Blackberry Pearl 8100 - Gizmodo
    Aug 25, 2006 · Notification: Polyphonic and MP3 ringtones, vibrate mode, on-screen or LED indicator and possible picture ID alerts. User Interface ...
  14. [14]
    Electronic and Information Technology Accessibility Standards
    Dec 21, 2000 · Section 508(a)(2)(A) required the Board to publish final standards for accessible electronic and information technology by February 7, 2000.<|separator|>
  15. [15]
    I-Mate K-JAM (HTC Wizard 200) | Device Specs - PhoneDB
    Aug 28, 2005 · A flash is used to brighten dark areas when taking photographs; is also used as, single LED Also known as mobile light. Aux. Camera Image Sensor ...
  16. [16]
    Nokia N95 User Manual [Page 14] - Essential Indicators - ManualsLib
    You have missed calls. Shown if. Ringing type. alert. tone, and. E-mail alert tone. The device keypad is locked. A clock alarm is active. The second phone line ...
  17. [17]
    Notification Led - HTC T-Mobile G1 User Manual [Page 40]
    HTC T-Mobile G1 Manual Online: Notification Led. The Notification LED located at the right corner of the earpiece provides information on the phone status ...
  18. [18]
    Nostalgia: I really miss this old HTC One feature - Android Authority
    Feb 14, 2025 · The notification LED on my old HTC One had different modes. It flashed green when I received a notification and orange when the battery was low.Missing: Wizard 2005
  19. [19]
    How To Setup Flash LED Alerts iPhone 6s, 6, 5, 4... Simple Tips
    Feb 12, 2016 · Here is how to setup flash alerts an notifications on your iPhone 6s, 6, 5, 4 using your iPhones LED camera flash.Missing: Sony Xperia OnePlus 2010s
  20. [20]
    Xperia 1 IV XQ-CT54/XQ-CT62/XQ-CT72 | Notification light
    Find and tap [Settings] > [Notifications]. Tap the [Use LED light to show incoming notifications] switch to enable or disable the function.
  21. [21]
    Create and manage notification channels - Android Developers
    Aug 26, 2025 · Create a channel for each type of notification you need to send. You can also create notification channels to reflect choices made by users.Missing: LED smartphones
  22. [22]
    LED notification apps compared - BeBuzz, HUB++, Powertools ...
    Jul 31, 2014 · BeBuzz costs $2.99, it doesn't offer more than LED notifications but it is highly customizable and has been a favourite since BlackBerry OS days.Missing: per- | Show results with:per-
  23. [23]
    Get LED flash alerts on your iPhone or iPad - Apple Support
    Mar 17, 2025 · How to turn on LED Flash for Alerts · Open the Settings app, tap Accessibility, then tap Audio/Visual. · Turn on LED Flash for Alerts. No alt ...
  24. [24]
    Control notifications on your Galaxy phone or tablet - Samsung
    To change this feature, navigate to and open Settings, then tap Lock screen and AOD. Tap Now bar, tap View more, and then turn on the switch next to your ...
  25. [25]
    LED Notification priority between applications in Android
    Apr 3, 2013 · Is it possible to define priority for my LED notification in such way that my application will replace already existed LED notification which ...How to get android application to take priority with the indicator lightAndroid L notification priority - Stack OverflowMore results from stackoverflow.comMissing: granularity category
  26. [26]
    Light Flow Pro - LED Control - Apps on Google Play
    ### Summary of Light Flow App Features for Per-App LED Control
  27. [27]
    Customize the Light Pulses on the Sony Xperia SP - XDA Developers
    Nov 5, 2013 · The app allows you to control each of the three LEDs of the illumination bar with individual RGB color selectors. It also gives you the option ...
  28. [28]
    Customize Your Android Phone's Colored LED Notification Light
    The free Light Manager app lets you configure the LED color and flash frequency for different types of notifications and apps, along with vibrations and sounds.
  29. [29]
    How to change the notification colors of your phone's LED light
    Mar 24, 2014 · These are notification lights that can glow in red, green, blue, or a mix of these three primary colors. Recent Nexus phones have such a light, ...<|separator|>
  30. [30]
    The Color and Blink Frequency of LED Notification Lights and ...
    This study explores whether the settings of the color and blink frequency of the LEDs notification lights affect smartphone users' urgency perception in two ...
  31. [31]
    How to change your LED notification colors on Android - nextpit
    Jan 31, 2019 · Light Flow Pro is the next app on our list. Just as Light Manager, it allows you to change the colors of your LED notifications.<|control11|><|separator|>
  32. [32]
    How to Customize Notification LED Behavior on Android | Beebom
    Sep 29, 2016 · In the “Lights” tab, you can enable/disable the LED light; change color, duration and the flash rate. There are a plethora of colors to choose ...
  33. [33]
    LED Blinker Notification Light - Apps on Google Play
    ### Key Features Summary for LED Blinker Notification Light
  34. [34]
    The Galaxy S10 Doesn't Have a Notification LED — Here's Why
    Feb 20, 2019 · You can't have a traditional notification LED when the space it needs to take up is currently occupied by that coveted screen real estate.
  35. [35]
    LG G Flex2 review: This is what the original should have been
    Feb 18, 2015 · The new G Flex2 is smaller, sleeker and a damn sight prettier than its predecessor, but still, we've got questions. Are curved screens any less of a gimmick ...
  36. [36]
    The Always On Display of the Galaxy S7 and Galaxy S7 edge
    Feb 22, 2016 · The new Always On Display (AOD) feature of the Galaxy S7 and Galaxy S7 edge puts an end to all of that. Now you can glance at your phone at any time.
  37. [37]
    Always-on Display: How does it affect battery life? - DXOMARK
    The results of our battery tests revealed that autonomy was largely impacted by this always-on screen feature, draining the battery about 4 times faster!
  38. [38]
    Google reportedly working on Always On Display for Pixel phones
    Jul 6, 2017 · Based on a system UI APK from Android O, it looks like Google might bring an Always On Display feature to its Pixel smartphones.
  39. [39]
    Galaxy S8 Edge Lighting updated: it's now cooler - PhoneArena
    Aug 29, 2017 · Back when Samsung introduced the Galaxy S6 edge, it added the so-called Edge Lighting feature to the phone. What it did was, ...
  40. [40]
    Edge lighting and LED notifications on Galaxy phones - Samsung
    Edge lighting makes lights appear around your Galaxy phone?s screen and camera cutout when you get notifications.<|control11|><|separator|>
  41. [41]
    LED Me Know - Notification LED - Apps on Google Play
    Rating 4.1 (9,279) · Free · AndroidLED Me Know shows a fully-customized animation when a notification is received on your device! Fully supported on Android 11, 12, and 13.
  42. [42]
    Control notifications on Android - Google Help
    To check if your device has notification history, go to “Settings,” then go to “Notifications.” You can use notification history to find: Snoozed notifications ...
  43. [43]
    Leveraging Wearable Technology for Critical Alerts
    Oct 17, 2018 · Wearable applications can also be faster and simpler to design than a mobile app, helping you get to market faster with a notification or alerts ...
  44. [44]
    Does Always-On Display Drain Your Phone's Battery? - SlashGear
    Apr 25, 2025 · Despite all these optimizations, the always-on display still drains your phone's battery. How much battery it uses depends on several factors, ...