A powerful surprise. The GP 23A is a 12-volt battery from GP's Super Alkaline category. It is commonly used in car keys and the speed sensors of bicycle speedometers. Essential for remote controls of audio and video devices. A must-have to ensure your devices in and around the house run for a long time without needing a battery change. This applies, for example, to wireless doorbells, car and burglary alarm systems, and remote controls, including those for garage doors. The battery has a diameter of 10.22 mm and a length of 28.5 mm. It has been specifically designed to guarantee a longer operating time across a wide temperature range and is mercury and lead-free. This alkaline battery, designated as 23A, is suitable as a replacement for batteries labeled A23, V23GA, and MN21.