X-DNENG Solar Charger 12000mAh Solar Power Bank High Capacity Solar Cellphone Chargers Portable Solar Battery Charger with LED Flashlight Waterproof Solar External Backup for IPhone 7 High Quality - This is a great achievement for the portable power bank on the planet: Solar power technology; environmental friendly and could recharge itself under sunshine for emergency purpose when outside;Shock-proof feature ensures the device working properly even it crashes or drops. High Capacity - Grade A cell, High Capacity, Build-in 12000mAh Lithium Polymer battery which charges via a powerful 1.2W monocrystalline solar panel ;2.1A output allows for simultaneous charging of your devices at high speed Anti-explosion, lightweight, compact and reliable, 1000+ recharge cycles over the life of the battery. High Demand - Environmental protection silicone shell, ABS + PC material plastic shell fireproof,football grain design has anti-skid protecting effect , perfect for long flights, road trips, hiking, camping or whenever you need to charge your mobile devices wherever you are. High Brightness - The LED light works perfectly in darkness, especially for emergency. Just press the button twice, the LED will light up ; 4 LED status of charge indicators indicate the charging and discharging process. The efficiency of energy transformation from solar to electric energy is really low even in a perfect laboratory condition, the transformation efficiency just 30%. When it used in outdoor, it also affected by the weather, the location or others factors. So the solar panel is not good as first choose to recharging. We suggest you recharge it via wall charger at the beginning, to make the power battery fully activated.