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.

• 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. 

• Serene CentralAlert Portable Remote Receiver
• Serene CentralAlert Dual Alarm Clock
• Serene CentralAlert Wearable Vibrating Receiver