The M12™ power source, compatible with all M12™ battery packs, features a 2.1 A 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 hrs of continuous heat on a single charge. (battery sold separately).