'Duracell offers a wide range of batteries to be used in electronics that require reliable power. Duracell Ultra Power AAA batteries are alkaline batteries ideal for powering all your devices. Duracell's Duralock Power preserves technology for up to 10 years in storage. Additionally, the Powercheck™ technology makes it easy to check how much power is left in each battery: you simply press the white dots on both ends of the battery and see the remaining amount of power on the energy meter. These AAA batteries are best used when you are looking for dependable and long lasting power in all your regularly used devices such as portable games consoles, shavers, remote controls, CD players, motorized toys, flashlights, toothbrushes, etc. Duracell Ultra Power AAA Alkaline batteries are our # 1 longest lasting batteries with Powercheck™ (on average across devices) and are also available in size AA, C, D and 9V.'