This solar panel can absorb sunlight and transfer the solar energy into electricity power, it can be recharged as long as there is sunlight. With USB port, it could charge MP3, phone, tablet computer and other USB devices. Light, easy to operate and use, very practical and durable. Features - Color: Black. - Material: Polysilicon silicon cell. - Size: About 43.00x20.00x1.00cm/16.90x7.86x0.39inch. - Solar panel, energy efficient and eco-friendly, transfer the sunlight to into electricity power. - Light, easy to operate and use, very practical and durable. - Premium materials and circuitry ensure long service life. Adopts polysilicon silicon cell, very practical. - Safe and eco-friendly, convenient to operate and use, durable and professional. - Portable use in any outdoor activities like camping, hiking, climbing, cycling, mountaineering, travelling, etc. Specifications - Working current: 3 (A). - Open circuit voltage: 21 (V). - Working voltage: 5v/18v (V). - Short circuit current: 5 (A). - High power: 20 (W). - System voltage: 600 (V). - USB output: 5V. - Number of USB ports: dual USB. - Solar panel voltage: DC12-18V. - Solar panel power: 20W; These are two outputs, one is DC12V and the other is USB 5v