Feature:  1. Made of high-quality materials, environmentally friendly, waterproof, durable and sensitive.  2. It can be used to charge mobile phones, mobile power supplies, laptops, tablets, GPS, cameras, etc.  3. Portable, foldable, light weight, easy to carry, and can reduce the freight burden for customers.  4. It is equipped with a multi-purpose socket for convenient charging.  5. Suitable for outdoor activities, emergency and outdoor work.  6. Used to charge mobile phones, MP3s, tablets or other USB charging devices.  7. Dual USB female ports, you can easily charge the device through the USB charging cable.  8. You can put the panel in the sun and use it to directly charge the device.  9. The 10-in-1 charging cable can charge multiple brands of mobile phones/electronic devices at the same time.  10. Very suitable for outdoor biking, mountaineering, hiking, camping, traveling, etc.    Specifications:  Product name:Solar Panel;  Power:20W;  USB output:5V;  Waterproof rate:IP65;  Solar panel voltage:20V;  Number of USB ports:Double;  Material:Monocrystalline silicon battery;  Suitable for:Cycling, Mountain climbing, Hiking, Camping, Traveling, etc.;    Product name:  Controller;  Application:Solar System Controller;  Current:10A, 20A, 30A,50A;  Model:PWM;  Step-down:28.8V;  Charging:27.4V;  USB output:5V / 3A;  Self-consumption:<10mA;  Discharge stop:21.4V;  Voltage:DC 12V / 24V;  Maximum solar input:<50V;  Rated working current:20A Type :( five types to choose ) TypeA: Only Solar Panel TypeB: Solar panel+10A Controller TypeC: Solar panel + 20A controller TypeD: Solar panel + 30A controller TypeE: Solar panel + 50A controller