This top quality passive infrared motion detector transmits a wireless RF signal to wireless receivers on this page when motion is detected. Can transmit on any of the 256 codes and to one or more of the 4 channels. A separate low battery signal is also transmitted when the 9V battery is getting weak. 9V alkaline battery included. Pulse count selectability enables the detector to be used in environments which would normally cause false alarms and this unit is designed with high immunity to air turbulence. Masking material is included if you wish to block certain areas from the field of view. Has walk test LED and test mode for easy setup. Very low power consumption only .006mA standby.