Olympia SB5500 Portable Solar Panel Battery Charger with USB and MicroUSB, 5500mAh 5500mAh lithium polymer battery for charging multiple devices Dual high efficiency solar panels allow you to charge your devices by harnessing the power of the sun Built-in USB cable for quick and easy recharging of the internal battery Integrated Micro-USB cable and two built-in USB ports let you charge multiple devices at once LED power indicator Charges small devices (e.g., cell phones) in apx. 2-3 hours Charges mid-size devices (e.g., tablets) in apx. 5-6 hours