DURMN2400B4Z - CopperTop all-purpose alkaline batteries are not only dependable, they're also long-lasting. You can take comfort in a 10-year guarantee in storage. They're great for many of the devices you use daily. From storm season to medical needs to the holidays, you know it's a battery you can trust. Use AAA CopperTop batteries for smoke alarms, flashlights, lanterns, calculators, pagers, door locks, cameras, recorders, radios, CD players, medical equipment, toys and electronic games.