Specifications:  Solar Panel:  Material: monocrystalline silicon.  Solar panel voltage: DC12V.  Solar panel power: 50W.  Panel size: 42x28cm/16.54x11in.  Open circuit voltage (VOC): 5V.  Short circuit current (Isc): 3A.  Output: USB.  Solar Controller:  Current (optional): 10/20/30/50/60/70/80/90/100A/Without Solar Controller.  Voltage: 5V.  Short circuit current: 3A.  Working temperature: -35℃~+60℃.     Features:  1. Used to charge cell phones, MP3s, tablets or other USB charging devices.  2. You can put the panel in the sun and charge the device immediately.  3. Very suitable for outdoor cycling, mountaineering, hiking, camping, traveling, etc.  4. Portable Design: Small in size and light to take, it is easy to carry for camping or other outdoor activities. Easy to install with pre-drilled holes on the back of panels for fast mounting and securing.  5. Plug and Play: Built USB port in the solar panel, come with charing cable, fit most kinds of device, plug and play, avoide out unexpected off power.  6. Waterproof: Advanced water and dust proof level, complete protection against environmental particles and low pressure water jets.     Package Included:  Without Solar Controller:  1 * Solar Panel.  2 * DC18V Output Clip.  1 * Car Charger.  4 * Suction Cup Adsorption.  1 * User Manual.  With Solar Controller:  1 * Solar Panel.  2 * DC18V Output Clip.  1 * Car Charger.  4 * Suction Cup Adsorption.  1 * Solar Controller(Types Optional).  1 * User Manual