
Serene CentralAlert Door Knocker Sensor
Never Miss a Knock, Ring, or Delivery
The Door Knock and Doorbell Sensor (CA-DX) ensures you’re always alerted when someone’s at the door.
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Detects door knocks through vibration sensing
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Connects to your existing doorbell, chime, or intercom (requires external connection)
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Adjustable sensitivity helps prevent false alarms
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Includes 2.5mm jack for direct connection to doorbell/chime*
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Simple installation – no complicated setup required
*When connected directly, the electrical signal from your doorbell or chime activates the CA-DX.
NOTE: This unit requires a compatible Serene Innovations Central Alert receiver (sold separately) to function.