Solar Power Bank Charge Cargador Portatil De Bateria Externa Telefonos 8000mAh SummaryWATERPROOF SOLAR CHARGER: Waterproof (IP66 rating), dustproof, anti-shock, skid resistance. Perfect for campers, hikers, skiers, construction workers, and many other outdoor enthusiasts.8000mah POWER BANK: Premium battery offers steady and lasting recharging;Dual USB outputs with CAP: Fast charge two devices simultaneously (USB Output 1: 5V/1.0A, USB Output 2: 5V/2.1A). Input 5V/2AEspecially for outdoor activities: 2 3W strong LED lights can be used as camping light and falsh mode can be SOS signal. If you lost, the compass on the back will be very helpful.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.