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Continue ShoppingCentralAlert Door Chime / Intercom And Door Knocking Sensor Model CA-DX
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 CA-360 to alert. Or, you can attach the CA-DX to the inside surface of your door to detect the knocking on your door.
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