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STI Wireless Doorbell Extender with Receiver Kit

SKU: STI3300

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Add an Extra Chime to Your Hardwired Doorbell

Hear your doorbell chime at an additional location in your home by setting up the STI Wireless Doorbell Extender with Receiver. This complete DIY kit comes with a wireless receiver that plugs into an outlet up to 500 feet away from your existing doorbell chime to alert you when the button is pressed.

  • Provides doorbell chimes for an additional location
  • Works with an existing hardwired doorbell system
  • Extender triggers alert at receiver when doorbell button is pressed
  • Wireless range up to 500 feet between units
  • Plug-in receiver supports up to 10 sensors total

How It Works

The included "Wireless Doorbell Extender" wires into your existing hardwired doorbell chime. When the existing chime receives a signal from your doorbell button, the extender also triggers and sends a wireless signal to the plug-in receiver. The receiver then alerts you by chiming. Your existing doorbell will continue to chime as well.

The receiver provides two different alert sounds to choose from, allowing you to customize your chime, and also differentiate between various transmitters (sold separately) in your system.

Expandable System

As part of the STI Wireless Chime Series, the included receiver can be used to monitor up to 10 wireless transmitters total (sold separately). Available add-on transmitters include door sensors, extra doorbell buttons, and more.


  • Wireless Doorbell Extender (STI-3331)
  • Wireless Chime Receiver (STI-3353)

Note: Requires a hardwired doorbell to operate. May not work properly with door chimes that play melodies or use batteries.

We Protect The Things That Protect You®

Safety Technology International (STI) is a family owned and operated business that began over 35 years ago with Jack Taylor's invention of the Stopper Pull Station Protector. STI now markets more than 1,000 products throughout the world that help prevent false fire alarms, theft, and vandalism of the devices that protect us all.


Product Features

Two Selectable Sounds

  • Ding
  • Ding-Dong

Technical Details

  • Manufacturer Part #: STI-3300
  • Frequency: 433 MHz
  • Wireless Range: Up to 500 feet (line of sight)
  • Power Source: Receiver plugs into 120 VAC outlet (minimum 110 VAC)
  • Dimensions:
    • Transmitter: 3.15(L) x 1.5(W) x 0.85(D) inches
    • Receiver: 5.0(L) x 3.25(W) x 1.425(D) inches
  • Approvals: UL, cUL, FCC, IC
  • Warranty: 1-Year Limited