Alarm Motion Sensor Detects conventional alarm sound from existing security system, it transmits a signal to Control Panel (SC-001) or Emergency Dialer (AD-433) which then activate the system. Can stand alone or used in conjunction with the Skylink system, also can be used as Smoke Sensor as long as smoke alarm is operational. Can be connected with other security systems using N/C connector. 9V Alkaline battery included. Range up to 100ft. #AS433E $37.99