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.
Updated: October 15, 2026Original publish date: October 15, 2026
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Both the ERA-EXTX and the LRA-EXTX transmitters run on one CR123A lithium battery, included.
- ERA-EXTX: rated for about 2 to 4 years, depending on use.
- LRA-EXTX: rated for up to about 2 years. It sends a low-battery signal to the receiver when the battery needs to be replaced.
Receivers
- ERA-RXPG and LRA-DCRXS: plug into a standard wall outlet. No battery.
- LRA-DCRX-L (in the LRA-EX1000): three C alkaline batteries, or an optional LRA-PLUG wall adapter.
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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.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.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.