Duracell Ultra AA batteries are 1.5v alkaline batteries ideal for powering all your devices with extra performance for high drain devices. Duracell Ultra has up to 100% more power for all devices* (*longevity performance compared to the Minimum Average Duration of the 2015 IEC AA Digital Camera test. Results may vary by device or usage pattern (www.iec.ch)). The Powercheck technology makes it easy to check how much power is left in each battery to avoid unnecessary interruptions in your device usage and enables you to re-use your batteries in low drain devices even when they no longer work in high drain devices (keep batteries together and not mix with unused batteries in second device). You simply press the white dots on both ends of the battery and see the remaining amount of power on the energy meter. Additionally, Duralock technology keeps unused Duracell batteries fresh and powered up to 10 years in ambient storage. These batteries are Duracell's recommendation for high drain devices, such as digital cameras, photoflash, high powered toys or boomboxes, and of course are great fit for the regularly used devices as motorized toys, flashlights, portable game controllers, shavers, toothbrushes and any other. In 1969, Duracell was part of the Apollo 11 mission and became the first battery on the moon. Pack of 4.