This is a device locker app. A Lazy proximity locker.
Forget the power button. Just put away your device, and let Lazilock turn off your screen and lock your device for you.
This app uses the proximity sensor, which is next to where the front camera usually is. It turns off the screen when the sensor is covered. So put your phone into your pocket, bag, turn it face down on the desk, or just wave your hand over the sensor, and it'll automatically lock!
Pro version include additional settings: vibration, landscape mode, delays.
Tags: power screen locker , smart lock just wave your hand