Elk Products Inc.
ELK-6023 Two-Way Wireless Recessed Door Sensor
The recessed door sensor mounts into a ¾” drilled hole in a wooden door jamb and becomes nearly invisible once the door is closed, providing the ultimate wireless security device for discriminating customers. It features ELK’s industry leading two-way technology with positive signal acknowledgement, extended range, and long battery life.
Click here for more information.