How Do I Install a Doorbell Extender Transmitter?
Connect the extender's three wires to the Front, Back and Trans screws inside your wired chime, mount the transmitter, then pair it.
Updated: October 15, 2026Original publish date: October 15, 2026
You do not need an electrician. The transmitter connects to the screw terminals inside your existing wired chime.
- Turn off power to the doorbell transformer, then take the cover off your wired chime.
- Find the terminal strip. Most chimes have three screws, labeled Front (front door button), Back (back door button) and Trans (transformer).
- Connect the transmitter's three wires, about 9 in long, one to each screw. If you have only a front door, connect the front and transformer wires and leave the back door wire unconnected.
- Mount the transmitter inside the chime cabinet if there is room, or on the wall next to or just above the chime. The ERA-EXTX includes double-sided tape; the LRA-EXTX includes mounting hardware.
- Plug in the receiver, pair it to the transmitter, and pick a melody for each door. Pairing steps are in the manual for your kit on the product user manuals page.
- Restore power and test both doorbell buttons before you put the chime cover back.
Your wired chime keeps ringing as before; the receivers ring at the same time.
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What Does a Doorbell Extender Do?A doorbell extender wires into your existing wired chime and sends a signal to wireless receivers in other rooms, so you can hear the doorbell anywhere.Will a Doorbell Extender Work With My Doorbell?Extenders work with standard wired chimes that play a ding-dong sound. They do not work with video doorbells, intercoms or alarm systems.Can I Add More Receivers or a Strobe to a Doorbell Extender?Yes. ERA and LRA extenders work with as many receivers as you need, and the plug-in receivers can flash a strobe with or without sound.ERA or LRA Doorbell Extender: Which Should I Choose?ERA extenders reach up to 4,000 ft and work with 5V-28V chimes. LRA extenders reach up to 1,000 ft and work with 9-18V AC chimes.What Battery Does a Doorbell Extender Transmitter Use?ERA and LRA extender transmitters each use one CR123A lithium battery, included, which lasts years. Plug-in receivers need no battery.