Solar Charger,Portable [Upgrade Version] 8000mAh Dual USB Solar Battery Charger External Battery Pack Phone Charger Power Bank for Outdoors (Black) 8000mah High Capacity: Built-in 8000mAh high capacity lithium battery equipped with a compact solar panel, which could recharge the battery itself under sunlight for emergency purpose while outdoor. Dual LED Flashlight & Built-in Compass: The 2 LED flashlight is bright, works perfectly in darkness, especially for emergency. It comes with 3 light Modes (Steady light /SOS /Strobe); Built-in Smart Compass on the back surface, it will be very helpful if got lost in outdoors. Superior Portability Design: Comes with the free hook, easy to hang on your backpack when outdoors; Waterproof, Dust-proof and Shock-Resistant, perfect for hiking, climbing, camping and other outdoor activity. The efficiency of energy transformation from solar to electric energy is really low, even in a perfect laboratory condition, the transformation efficiency just 30%. We suggest you recharge it via wall charger at the beginning to make the power battery fully activated. Dual USB Charger Ports with Cover: 2.1A USB port for iPad/Tablets. 1.0A USB ports for smartphone or other devices; can charge two devices simultaneously, support all digital electronic devices with 5V/1A-2.1A input.