Duracell a23 12 volt battery. Very popular battery for all bite alarms that require 12 volts of power to operate. As a rule if your bite alarm requires a small single cell to operate then it will have a 12v circuit. If your bite alarm requires 2 x small cells click here. These cells are also used in key fobs for alarm systems. See dimensions below.

A23 type, 27mm (L) X 11mm (D), High performance long lasting power.