Features
- Serene Innovations CentralAlert Wireless Door-Bell Knock Sensor detects the vibration of your existing door bell, door chimes, door intercom
- Can be wired directly to the doorbell terminals where the electrical signal activates
- Simple to install with adjustable sensitivity to avoid false alarms
- 2.5mm Jack for direct connection to your existing doorbell/door chime
- With this method, electrical signal from your doorbell terminal activates CA-DX
- 2.4GHz operating frequency
- Up to 200 ft operating range
- Uses 2 AA alkaline batteries (not included)
