The EZOPower Solar Battery Charger is a great back-up battery for your smartphone or mobile device when you"re camping, hiking or doing other outdoor activities. Simply use the solar panel to store the energy from the sun, or charge the battery from the standard USB port for a quicker charge. The lightweight and durable material is designed for outdoor use, with a clip design for easy positioning or carrying around. Features: High efficiency solar panel maximizes and absorbs the sun"s energy. Built-in high capacity 7200mAh external battery LED power indicator makes it easy to know how much battery power you"ve got left Durable material and clip design perfect for outdoor use Multiple charging tips included for most smartphones or other 5V USB-charged devices Specifications: Battery Type: Lithium-Polymer. Battery Capacity: 7200mAh USB Output: 5V, 1A USB Input: 5V, 1A (micro-USB) Solar Panel: 5V, Max. 180mA LED Power Indicator Dimension: 5.7" x 3.3" x 0.6" / 145 x 84 x 15 mm Weight: 8.04 ounces / 228 grams Package includes: Solar Battery Charger, USB Cable, Charging Tips, Keychain, Strap, User Manual. NOTE: The unit will only charge up to 50-60% when using the solar charging - Great for emergency power. Use USB charging to charge the internal battery fully. For best results, battery should initially be fully charged via USB overnight, or min. of 6hrs. It is also recommended to charge overnight via USB if battery has been stored or been unused for long periods of time. Battery will recharge best via solar panels under strong sunlight, which may take up to 20 hrs in full daylight to fully charge. However, solar battery will maintain a relatively consistent charge under sunlight while charging your devices