Never be lost without battery back-up. AMP Prong is a rechargeable 6700mAh battery providing up to 4x extra battery. 2 USB ports deliver 2.4A output. Built in wall prongs for quick recharging. Smart Sense ensures complete device compatibility. Hyper-charge technology provides ultra-fast charging of your devices; up to 65% faster than competitors. myCharge understands your investments in your phone device is not cheap and neither should your portable battery charger. Safe-cell technology provides the highest level of battery safety.