Progo Brand Moblie Power Station 1900mAh High Capacity External Battery & Solar Charger For Apple iPhone 4 3G 3Gs, iPod Touch and more. Work as a extra battery or power bank for Apple iPhone, iPod Charge by Solar Power or Apple USB PC Cable. Votage: 5V, Capacity: 1900 mAh Battery Type: Li-ion, No Memory Effect One Year USA Warranty!