Driveway Patrol Wireless Motion Sensor Detector Alarm Infared Alert System 400ft Installs in seconds, No tools or wires, Motion activated Detects people or vehicles, Battery operated, Durable weather resistant plastic construction 400 foot transmission distance between tranmitter and receiver, Receiver makes a pleasant chiming sound when sensor is crossed, Receiver uses 3 C-sized batteries and transmitter uses one 9V battery (not included) Must be placed 3 feet above the ground, Transmission Range: 400 feet (open area) Transmission Frequency: 434MHz, PIR Sensor Range: 20 X30 feet, Reciever: Adapter of DC4.5V/500mA (Not Included)