Serene CentralAlert Door Knocker Sensor

Serene CentralAlert Door Knocker Sensor

Serene Innovations

  • $84.99
    Unit price per 


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.

  • Detects door knocks through vibration sensing

  • Connects to your existing doorbell, chime, or intercom (requires external connection)

  • Adjustable sensitivity helps prevent false alarms

  • Includes 2.5mm jack for direct connection to doorbell/chime*

  • 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. 


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