Solar Panel, VINSIC 22W High Efficiency Solar Charger Foldable and Portable Dual-port Solar Panel High Efficiency: Vinsic 22W high-efficiency solar panel provides up to 23.5%-25% conversion efficiency, while the monocrystalline panel conversion efficiency is only 15%. Industrial-strength PET plastic faced solar panels sewn into high-wear polyester canvas for weather-resistant outdoor durability. Intelligently Identify: Under direct sunlight, when the two USB ports are both used, the maximum current can reach to 3A; otherwise, when either one of the two USB ports is used, the maximum current can reach to 2.1A. It greatly improves the charging efficiency. Perfect for rapidly charging Smartphones, Tablets, MP3 Players , GPS Units and more while emergency preparedness, Camping, Hiking , Backpacking and other Outdoor Activities. No additional battery needed for charging external devices, 100% green energy with zero carbon footprint, built-in dual USB ports for simultaneously charging two devices.