The most efficient, integrated compact power pack available. Internal battery keeps extra energy at hand, and twin solar panels keep the battery at peak capacity in less time. Ideal for charging personal devices like iPods and smart phones. Advanced polycrystaline solar technology gathers maximum energy per inch for maximum efficiency. Power storage capacity: 2,200 mAh Output: mini-USB Features:- Water resistant- Durable rubberized shell- Internal rechargeable Lithium Polymer battery- Power gauge and auto shut-off- Solar Panel: Two (2) 100 mA polycrystalline- Battery Storage: 2,200 mAh battery.- Output: 1,000 mA / 5V (USB 2.0 compatible)- Dimensions: 5.5x3x1.25- Weight: 8.6 oz.- Mini-USB output- Charges from solar panel, computer USB or from included DC adapter