Operates reliably in temperature extremes of -20 degreeC to 54 degreeC Recommended for a variety of devices. Works great in smoke alarms, flashlights, lanterns, calculators, pagers, door locks, cameras, recorders and more. Remains ependable after 7 years of storage. Duracell(R) CopperTop AAA Alkaline Batteries, Pack Of 10 is one of many AAA Alkaline Batteries available through Office Depot. Made by Duracell.