Night vision by sat app this app use in wifi video surveillance industry. via the iphone get the video from p t p extra wifi camera . 1>iphone choose the wifi video module wifi network. wifi video module transfer the camera video siganl to smart phone via the wifi agreement. 2>then open the app , user via the app can check the a distant camera's video. 3>the phone also can send some control data to the distant camera via the wifi agreement. 4>transmission distance: 60m (open area)