http://www.gadgettown.com/Home-Business-Burglar-Alarm-Motion-Detector-Sensor.html
This is Home Business Security Burglar Alarm Motion Detector Sensor, it provides a reliable and cost-effective solution based on PIR technology. With outstanding password, engine password, user password, monitor, convenient to user operation and engine monitor. This detector is compact and attractively designed to meet the needs of residential installations. It is programmed to withstand all possible interferences which are inherent in a residential environment, yet provides excellent performance in intruder detection.