This is a versatile solar charger and battery, and one of Voltaic System’s most compact and travel-friendly chargers. You can use to recharge just about any handheld device. Just plug in a USB charger to the port on the battery. Alternatively, you can choose from among one of the five adapters that come with the Amp charger. Oh, and the battery offers you up to 19 hours of talk-time. Let it soak in one hour of sun, and you get another three hours of talk-time