The wireless Doorbell-Door Knock and Door Chime Sensor is part of the CentralAlert Notification System by Serene Innovations. It sends to the CentralAlert receiver to notify you when someone rings your doorbell. The CA-DX sensor can also be attached to the inside of your door to detect door knocks.
- Detects vibrations of existing doorbell, door chimes, door intercom announcer or knocking and sends a signal to the CA360 unit
- Easy to install with adjustable sensitivity to avoid false alarms
- 2.5mm jack for direct connection to existing doorbell-door chime
- 2.4GHz operating frequency
- Up to 200 ft operating range
- Uses 2 AA alkaline batteries (not included)
- Dimensions: 2.5" x 3.8" x 1"
What else do I need to make this work?