Expand your Wireless Alert System with additional transmitters (use up to four with one receiver). Receiver distinguishes each transmitter with a different tone, so you know which area has someone slinking around your property. For use with Item# 333182. U.S.A. Application: Add-on sensor for #333182, Detections Motion (ft.): 15-30You will not be disappointed with Chamberlain CWPIR Wireless Motion Alert Add-on Sensor
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