Motion activated alarm and door chime. Dual-purpose passive infrared alarm detects movement in any selected area. Two modes of operation allows it to function as a door chime and also a 110 dB alarm. The door chime is useful for alerting you of someoneís presence. The alarmís programmable keypad offers added security since you will have control over the access code. Adjustable sensor head rotates so you can selectively choose the area covered. A low battery indicator tells you when the battery needs to be replaced. Comes with complete mounting kit and instructions. 9 volt battery (sold separately).