Serene-Central Alert Door Knock

Hang this door knock sensor on a doorknob and detect vibrations from knocks on the door. It will send a signal to any of the Central Alert receivers. It is ideal for hotel rooms. It uses 2 AA batteries (not included) and has an operating range of up to 200 ft.

1 yr warranty

Item No. HC-CADXH - $59.95

Add To Cart - View Cart