Operates reliably in temperature extremes of -20B0C to 54B0C Recommended for use in a variety of machines. Works great in in smoke alarms, flashlights, lanterns, calculators, pagers, door locks, cameras, recorders, radios, CD players, medical equipment, toys and electronic games. Guaranteed for 10 years. Duracell(R) CopperTop AA Alkaline Batteries, Pack Of 10 is one of many AA Alkaline Batteries available through Office Depot. Made by Duracell.