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Powers devices such as watches, calculators, sporting goods, games, medical devices, and moreCR2032 Battery 3-Volt Micro Lithium Button Coin CellLong-lasting, reliable battery life; performs in extreme temperaturesIdeal for vernier callipers Laser Pointer, Hearing Aids, Insulin Pumps, Heart Rate, Monitor, Watches, Cameras, Calculators, Car Security Alarm, Keyless Car Remotes, Organizers, Glucometer, Computer Equipment (memory backup battery) CMOS, Toys, Communication Equipment, data pack for video cameras, and other devices that requires this battery size!