We provide an unavailable feature in android at meantime. Imagine you are in places like. Dark place at night OR heavy music party OR watching a fantastic movie. Hospital OR religious places OR in-door meetings. Writing assignments OR studying OR sound sensitive environment. Where you don't want to hear ringtone or even feel a vibration.
It's free of charge to get the installation package of Flash Alerts Notifications, also, you can take a look at users' reviews on Droid Informer. The app works fine on Android 4.0 and higher. It's safe to download this application. Flash Alerts Notifications is designed by DHEW and its category is Tools.