Duracell MN21/23 Alkaline Battery 4-Packs - For Car Alarm, Motion Detector, Garage Door Opener, Door Lock, Security Device, Keyfob Transmitter, GPS Device, Remote Control, Child Locator - 12 V DC - 36 / Carton MN21 Alkaline Battery provides trustworthy power. Use in car alarm, key fob, GPS tracker, child locator and remote controller. This 12-volt battery is equivalent to A23, MN21, 23AF, 23AE and V23GA.