Flash Alerts Ultimate is an Android app that lets you know about incoming notifications, calls, and messages through flash blinks. This free app by MobileUps supports 75 languages and is highly customizable, allowing you to adjust the frequency, duration, and repetition of the flash alerts.

The app's features include flash alerts for phone calls, SMS, application alerts, and unanswered alerts. Whenever you get a notification from any app, such as WhatsApp, Facebook, or Gmail, the flash will blink. You can also set the flash to blink when you have unread messages or unanswered calls.

Flash Alerts Ultimate is designed to save your battery life. You can set the percentage of battery life at which the app stops working and also set the number of times the flash will blink (between 1 to 45). The app comes with video tutorials to help you if you have any difficulties with the settings.

Overall, Flash Alerts Ultimate is a useful app if you want to stay notified of your smartphone's activities without having to constantly check it. However, keep in mind that the app may not work on all devices and may not be compatible with some apps that use the notification system differently.