It is particularly interesting application for Android phones which you can turn on and off the screen just by moving your hands
* Only phones that are Proximity sensor (sensor to your phone's screen during calls when the phone by his ear cut off)
This app will tell you there is no need of physical buttons Power
Allows you to without touching the screen or your phone, to switch on and off it.
Install the app on your phone and turn on and off the page with this method, not all surprised.