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Knock Sensor with Transmitter
A sensor that flashes with a door knock and sends a signal to the Door Beacon Receiver. Transmits up to 75 feet. Over-the-door hanger included. One year warranty.

What else do I need to make this work?
This knock sensor will flash when someone knocks on the door, however in order to be notified in another area, you will need to purchase the Door Beacon Receiver.

[Click for user manual]