Solar Charger, PowerBen&reg; Solar External Battery Pack with 6LED Flashlight 15000mAh Dual USB Cell Phone Battery Pack Outdoor Backup Charger for Bluetooth iPhone HTC Nexus Camera Tablet Samsung 15000mah High Capacity: Built-in 15000mAh high capacity lithium battery equipped with a compact solar panel, which could recharge the battery itself under sunlight for emergency purpose while outdoor. Dual USB Charger Ports: Dual USB ports allow two devices charge simultaneously, 2A port for iPad/Tablets, 1A port for cell phones/Bluetooth. Automatic identification provide high speed charging. Superior portability design: Dust proof outdoor solar cell phone charger, don't worry for losing any power on hiking, camping, traveling. Easily hang it on your bagpack with the INCLUDED HOOK, hands-free on the go. Perfect for hiking, climbing and other outdoor activity. LED Flashlight/Emergency Light: The LED flashlight works perfectly in darkness, especially for emergency. Just press the button twice, the LED will light up for flashlight mode. press again, the LED will flashing for emergency. 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.