Super fresh genuine Duracell MN27 12v batteries. Works for: Laser Pointer Insulin Pumps, Heart Rate Monitor, toys ,Watches, Cameras, Calculators, Car Security Alarm, Keyless Car Remotes, Organizers, Computer Equipment (memory backup battery) CMOS, and all other devices that requires this battery size. Equivalent to:GP27a, MN27, G27A, A27, 27A, L828, EL812, EL-8212, CA22.