Brinno KNS100 Knocking Sensor for PHV133012 Electronic PeepHole Viewer
For use with the Brinno PHV133012 Digital PeepHole Viewer. This sensor fits into a slot on the back of the Digital PeepHole Viewer and triggers it to take a picture of anyone knocking at your door by sensing the vibration produced by knocking. Provides added security by allowing the Digital PeepHole Viewer to record photos of who's at your door even when you're not home. No batteries needed. Not for use with the optional Motion Sensor. Not compatible with the original Brinno PHV132512 Electronic PeepHole Viewer.