Decibel (Sound Meter) (nintenda.decibel) on Google Play
"Decibel" allows you to measure the sound level (dB) and the amplitude of the sounds around you! And more, you can activate the flash function will launch the flash according to the sound, music and even your voice! This free sound level meter (or decibel meter) is an essential tool for your smartphone :)And all this in an application that is less than 750kb!