Simply place the transmitter near the entrance to your driveway or other entry way and if anyone passes by you will hear a pleasant chime alert.

Installs in seconds, no wiring required—just place the transmitter outside and the receiver inside wireless transmitter sends alert signal over 400 feet Instantly alerts you if customers enter your store while you are away from the entrance area, or if children attempt to leave the house Uses PIR (passive infra red) beam to detect motion

Specs: measures in at 4 1/2 inches x 2 1/2 inches x 2 1/2 inches. The receiver measures in at 4 11/16 inches x 3 1/2 inches x 1 1/2 inches. The transmitter requires 1 9 volt battery that is not included. The receiver requires either 3 C batteries that are not included or a 4.5 volt adapter that is not included.