Portable Solar Charger Power Bank, Waterproof Solar Battery Pack with 3 Solar Panels for Phone and Camping TravelPowerful Technology: It can automatically adjust the current and voltage to achieve maximum power,delivering its fastest possible current up to 2A under direct sunlight. High Efficiency: Built with solar cell from US, up to 20. 5% efficiency, while most panels in the market are 15% efficiency. Dual Port Output: You can charge 2 devices simultaneously, maximizes output up to 2. 1A. It can fully charge a 2000mAh mobile phone very soon. Slim and