dodocool Solar Charger, Solar External Battery Pack Built with SunPower Solar Panels 4200mAh 4 LED Flashlight for iPhone iPad Android Phones Black [High Energy Conversion] Built with SunPower polysilicon solar panels, its maximum solar conversion efficiency is up to 22%. Great for converting sunlight into electricity and recharging itself under sunshine. [Portable Battery Charger] Internal 4200mAh lithium polymer battery can charge USB powered devices with maximum output of DC5V / 1A. Recharged via the solar panel or the included micro USB cable. [Powerful 4 LED flashlight] The high power 1W 4 LED flashlight works perfectly in darkness. Rotatable design is great for camping, reading, biking, emergency, etc. [Superior Portable Design] Lightweight, pocket-sized, easy to carry. The collapsible metal holder lets you adjust it to different angles flexibly in order to absorb sunlight efficiently. [Note:] Please do not take solar as main power source as it mainly for topping off. It's subject to sunlight intensity and panel conversion rate, which may take long time to charge.