The M12 power source, compatible with all M12 battery packs, features a 2.1 amp powered USB port that charges tablets, smart phones, mp3 players, and other portable electronic devices. This smart-charge port identifies the electronic device being charged; delivering fast, safe charging. The adapter features an on-board fuel gauge, and is compatible with all M12 heated gear, providing up to 6 hours of continuous heat on a single charge. (Battery sold separately).