Energizer A23 battery, 12 Volt, package of four (4) batteries. These batteries are good for all electronics, remotes, etc. Equivalent to: 21/23 23a 23ga MN21 12V battery gp23ae.

SadoTech Model CXR Wireless Doorbell, 2 Plugin Receivers with Easy Install, Over 1000-feet Range, 52 USA Chimes, Adjustable Volume and LED Flash

Wireless Doorbell, FullHouse Waterproof Door Chime Kit Includes Push Button Transmitter and Plug-In Receiver, Over 1000 feet Range, CD Quality Sound and LED Flash (2 Transmitter + 4 Receiver Black)

CROSSPOINT Expandable Wireless Doorbell Alert System, Multi-Unit Base Starter Kit includes 2 x Long Range Plug in Receivers and 2 x 100% Waterproof Transmitter Buttons, Model ECBase, Gloss Black

CROSSPOINT Expandable Wireless Doorbell Alert System, Multi-Unit Base Starter Kit includes 2 x Long Range Plug in Receivers and 2 x 100% Waterproof Transmitter Buttons, Model ECBase, White

LAMPVPATH (Pack of 6) A23 Battery Holder, 12V Battery Holder, 23A Battery Holder, 12V Battery Case with Leads Wires

Wireless Doorbell, FullHouse Waterproof Door Chime Kit Includes Push Button Transmitter and Plug-In Receiver, Over 1000 feet Range, CD Quality Sound and LED Flash (2 Transmitter + 3 Receiver Black)

Mail Chime MAIL-1200 Wireless Mail Alert System

SadoTech Model C Wireless Doorbell, Easy Install, Over 1000-feet Range, 52 USA Chimes, Adjustable Volume and LED Flash, (Beige)

SadoTech Model CXR Wireless Doorbell, 2 Plugin Receivers with Easy Install, Over 1000-feet Range, 52 USA Chimes, Adjustable Volume and LED Flash, (Beige)

Physen Model CW Waterproof Wireless Doorbell kit with 2 Push Buttons and 4 Plugin Receivers,Operating at 1000 feet Long Range,4 Volume Levels and 52 Melodies Chimes,No Battery Required for Receiver