STI 3331 Wireless Doorbell Extender Sensor







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This musical wireless doorbell chime connects to your existing traditional hard wired doorbell and extends where you can hear your doorbell. Once the unit is wired into your existing system, the included receiver can be plugged into any standard electrical outlet up to 500' (line of sight) from the existing doorbell. This allows you to hear when someone is at your front door when you are in the basement, garage or other part of the house or business, where you normally can't hear your doorbell.

This transmitter sends a signal when the front doorbell button is pressed causing the receiver to play "ding-dong" and "dong" for the back or secondary doorbell button.


  • Wireless Extend-A-Chime works with existing doorbell.
  • Extends the range of which you can hear your existing doorbell unit.
  • Up to 500' (line of sight) from the chime transmitter.
  • Receiver has a low and high volume adjustment.
  • Selectable sound options are:
    • Ding
    • Dong
    • Ding-Dong
    • Westminister - 4 note
    • Westminister - 8 note
    • Knock Knock
    • Jingle Bells
    • Barking Dogs
    • Bicycle Bell
    • Buzzer
  • Model: STI3331
  • 0 Units in Stock
  • Manufactured by: STI Safety Technology Int'l

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