CentralAlert Door-Bell Knocker/Sensor

- Detects the vibration of your existing door bell, door chimes, door intercom announcer or the knocking 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- Advanced Technology: 2.4 Ghz Smart-Code- Operating range: Up to 200ft, open space - actual distance varies according to house construction- Battery type: Two AA size alkaline- Battery life: up to 10 months- Operating temperature: + 10 to +30°CSICADX UPC : 6932878100503 SKU: SI-CA-DX