FANTTIK 100W Portable Solar Panel is made of an industry-leading SunPower solar panel that converts up to 23% of received solar energy into electrical energy. A controller with MPPT technology intelligently manages powerflow to maximize efficiency. Fanttik solar panels are of 32 separate monocrystalline silicons, and any damage to one of them will not affect the overall use. It is fully waterproof due to a seamless, one-piece design, making it ideal for outdoor activities like camping and hiking.