[High Efficiency Energy Conversion]:Our 40W solar panel is made from high performance A+ monocrystalline solar cells,achieving conversion rate of up to 23.5% under sufficient sunlight [IP67 Waterproof]:This portable solar panel charger is waterproof,wear resistant and high temperature resistant ETFE protective layer that can work normally in various harsh weather conditions.However,to extend the life of this folding solar panel,please do not immerse it in water and note that the junction box is not waterproof; keep it dry before use [Easy to Use]:Open the solar panel and place it under direct sunlight; adjust the portable solar panel to ensure that the light source is perpendicular to the panel and there are no obstacles.Then connect your device with this 40W foldable solar panel [Size]:This portable solar panel charger is 55.5cmx19cm/21.85inch x 7.48inch ( unfolded size),making it compact enough for travel yet large enough for efficient energy conversion [Wide Use]:Folding Solar Panel Charger is ideal for outdoor activities like camping,hiking,traveling,backpacking and more.where access to power outlets may be or unavailable