The app turn off and lock your screen by detecting the preset holding angle of the phone. It detect the phone’s back cover angle with the ground and turn it off if it reach a predefined angle.You do not need to wait for the timeout or pressing the power button on your phone to turn it to sleep mode. Power buttons for different device are located in different position. If you have more than one device (e.g. phone and tablet), you will found that it is difficult to press the power button on different positions. For new android tablet, virtual buttons will also make you difficult to locate the power button position, because you can use it in any orientations.There is a mini task killer that you can also clean up your RAM when you are locking your screen via this app. It will save a bit of battery for your device, because you can quickly turn the screen off and do not need to wait for the timeout.