The PNY Curve 5200 Power Pack is a universal rechargeable battery designed to provide you power wherever or whenever you need it. A fully charged 5200 Power Pack can recharge most smartphones up to two times*. Ideal for charging your Apple, Android, Windows, & Black Berry devices. Free yourself from the wall. Power on the go. Specifications + Output to Device: 5 Volt 2.1 Amp (USB port) + Input to Power Pack: 5 Volt 2 Amps (Micro-USB) + Easy to read LED battery level indicators + Micro-USB cable included for charging devices & the Power Pack + Universal USB (Universal Serial Bus) output for wide range of devices + Pre-charged & ready to use + Premium quality rechargeable Lithium-ion battery + Works with smartphones