Come and Check Our Branding Solutions.The solar panel is composed of three monocrystalline solar cells, with a conversion efficiency of up to 23%. Compared with traditional solar panels, it can more fully convert sunlight into electrical energy. Our portable solar charger ?is made of durable oxford fabric and IPX5 waterproof material, which is not only waterproof but also hard-wearing. It can withstand all bad weather conditions, ideal for travel, camping, hiking, earthquakes, disasters, and other emergency charging. Pls check inventory and detailed info before placing your orders.