Motion detection for Android

Motion detection app for android description: attention : for proper operation the phone must be located in a place with no movement.
Not hold with your hand put it in a solid place.
+ What does this app? Detects movement of objects that are being targeted by the camera.
When the detection occurs sounds with the selected sound.
+ For what i can use? You can use it to leave your phone or an old phone that you no longer use at the entrance of a room or a shop.
+ How does it work? Uses an algorithm to process the video from the camera and detect motion by comparing frames.
Unlike others the algorithm used allows detection even with very low light condition.