Converting virtually unlimited supply of solar power to much needed battery juice for your mobile devices such as an iPhone, iPad and many, many more USB portable devices while you are on the go or there is a power outage or disaster strikes, the Instapark Mercury 10 is a light and compact USB solar charging system that easily fits in your purse, messenger bag or backpack. It combines three solar panels totaling 10 watts and folds up into a pack about the same size as a hardcover book, but only thinner and lighter. Unlike most of the solar chargers with unstable circuitry thus requiring a battery pack for power storage and charging external devices, the Mercury 10 are sophisticatedly designed and engineered and comes with dual standard USB ports for directly plugging in the included back-up battery pack, your cell phones including all generations of iPhones, tablet computers including iPad 1 & 2, MP3 players, USB battery/power packs and many other USB compatible mobile devices. Up to two devices can be charged at the same time. For added convenience, a Battery Pack, and a USB charging cable are included for easy power storage ensuring that your indispensable mobile devices will still have their needed power even in adverse weather conditions. Technical Specifications: Power input: 10-watt Mono-crystalline solar panel Power output: 5V Standard USB port x 2 Maximum output current: 2 amp Operating temperature: 32 - 86 F (optimal) Storage temperature: 32 -104 F (optimal) Dimensions: 9 X 6 X 2 inches (folded) 9 x 22 x ½ inches (unfolded) Weight: 12 Oz Warranty: 1-year What"s in the box: Instapark Mercury 10 solar charging kit 5200mAh Battery Pack , USB charging cable