My sensor is beeping every few minutes

If your sensor is beeping regularly every few minutes, and/or if an LED light flashes once per second, this indicates a low battery.

Please replace the batteries. Afterward, you may need to re-link the connection between the receiver and the sensor. Please follow the instructions listed here under the section titled "Linking Motion Sensors To The Receiver". 

Once new batteries have been placed in the sensor, and a connection between the receiver and sensor has been established, test the sensor by waving your hand in front of it. If an LED flashes, the sensor is functioning correctly. If no LED flashes, and if the pairing between the receiver and sensor has failed, the sensor may unfortunately be defective.