Warm Notice: The solar controller is universal for 12V and 24V, but currently the supporting solar panel is used for 12 volts, so this complete set is designed for 12 volts. Features: Made of premium-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 conservation 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 Controller Current Selection: 10A, 20A, 30A, 40A, 50A, 60A (Optional) Solar Panel Power: 20W Controller Power: 300W USB Output: 5V Number of USB Ports: 2 Solar Cell: Monocrystalline Silicon Solar Panel Size: 330*360*3mm Solar Panel Open Circuit Voltage: 21.6V Solar Panel Short Circuit Current: 1.11A (Max) Output Port: Dual USB, DC5521 Female Product Use: Charge 5V devices such as mobile phones and sports cameras, and charge 12V car batteries such as cars and boat Package Size: 34*38*3.5cm Package Weight: 715g Package List: 1* Flexible Solar Panels Kits 1* 40A Controller 1* Car Charger Cable 1* Alligator Cip 1* Cigarette Lighter Cable 2* Buckle 4* Suction Cups