Product Overview
Hang the CentralAlert™ CA-DX Door Knock Sensor on a doorknob and detect vibrations from knocks on the door.
The Door Knock Sensor with Door Hanger is part of the CentralAlert Notification System by Serene Innovations. It sends to the CentralAlert receiver to notify you when someone is knocking on the door. The CA-DX Door Knock Sensor is ideal for bedrooms or hotel rooms and is safe and secure since there is no part visible outside the door. Compatible receiver (not included) is needed for this sensor to work.
Features:
- 2.4GHz operating frequency
- Up to 210 ft operating range
- Uses 2 AA alkaline batteries (not included)
- Dimensions: 2.5" x 3.8" x 1"
| Warranty | One year limited warranty |
|---|---|
| Brand | Serene Innovations |
| Product Type | Signaler |
| Signaler Type | Door Knock |
| Signaler Style | Wireless |
| Signaler Alert Type | None built-in |
| Lamp Plugin | No |
