Warm notice: The solar controller is universal for 12 and 24, but currently the supporting solar panel is used for 12 volts, so this complete set is designed for 12 volts Features: Made of high-quality materials, environmentally friendly, durable and delicate. It has a high conversion rate. Dual-output solar panels with USB interface to meet any of your requirements. Environmental protection and pollution-free, realizing the conversion of solar energy to electric energy It has a wide range of applications and can be used in many places, such as automobiles and small household appliances. A solar panel is a device that directly or indirectly converts solar radiation into electrical energy by absorbing sunlight. Compared with ordinary batteries and rechargeable batteries, solar panels are more energy-efficient and more environmentally friendly. Specifiations: Name: Flexible Solar Panel Type:Standard Kit/Standard Kit+Controller (optional) Controller current selection: 10A, 20A, 30A, 40A, 50A, 60A (optional) Material: Polysilicon Contronerpower: 300W USB output: 5V Number of USB ports: 2 Size: 43 * 20cm Color: as show Packing list: 1*Standard Kit+Controller