Serene Innovations CentralAlert™ CADX
Install device on existing door chime or intercom door announcer for vibration detection. When someone rings your door bell, it detects vibration and sends a wireless signal to trigger the CA360 to alert. Or, you can attach the CA-DX to the inside surface of your door to detect the knocking on your door.
- Detects the vibration of your existing door bell, door chimes, door intercom announcer or theknocking on your door, it then sends a signal to trigger the CA-360 to alert you
 - Simple to install with adjustable sensitivity to avoid false alarms
 - 2.5mm Jack for direct connection to your existing doorbell/door chime
 - 1 year warranty
 
*With this method, electrical signal from your doorbell terminal activates CA-DX