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SadoTech Wireless PIR Motion Sensor Doorbell Operating at over 500-feet Range with Over 50 Chimes, No Batteries Required for Receiver, (White), Fixed Code C Series 

The SadoTech Wireless PIR Motion Sensor is a doorbell-operated motion sensor that triggers the main doorbell unit. As opposed to more expensive home security systems, this device works well as a simple alert unit. The SadoTech is particularly useful in areas where its presence makes residents feel more secure, such as a porch or basement apartment.

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