The GP A27 MN27 Batteries are 12V Alkaline batteries with a diameter of 8mm and a height of 28mm. They are designed for long expiry and come in unit quantities ranging from 1 to 10. These non-rechargeable batteries are suitable for various applications such as car key fobs, garage remotes, alarms, and low drain devices. Made by GP Battery, they have a zinc manganese dioxide chemical composition and operate within a temperature range of -18C to +55C. With a nominal capacity of 20 mAh and a voltage of 12V, these batteries are a reliable choice for powering a range of devices.