Features:  1. USB Smart Charging Technolog: The build-in smart IC chip intelligently identifies your device, and maximizes its charging speed while protects your devices from over charging and overloading. The charging current of USB ports (5v/2.1A Max) is monitored and automatically adjusted according to the sunlight level. Good for charging smartphones and tablets, GPS, digital cameras and other 5v usb devices.  2. High Conversion Efficiency: Constructed of high-efficiency solar arrays, convert up to 21.5-23.5% of solar power into free energy.  3. Fold Up As a Briefcase: When folded(16.22??16.53in), the solar charger looks like a briefcase easy for transport and will weigh just about 3.66 pound; When unfolded (33.46??16.22in), it can hang on your RV, tent, or just spread out on the beach to gives you instant charge from sunlight.  4. Use The USB And 18V Ports at The Same Time: The solar panel will split the incoming solar power between the two ports to charge devices simultaneously.5V USB and 18V DC dual output keep your USB/DC devices full of juice, without having to rely on a wall outlet, or a power bank, and brings you an unplugged lifestyle.  5. Designed specifically for all those people with passion for, camping, hiking, climbing, picnics, fishing, boat, etc.    Specifications:  Rated power: 50W;  DC charging output： 18V;  USB charging output： 5V;  Cell efficiency：21.5-23.5%;  Size： Folded: 16.22*16.53inch;  Unfolded: 33.46*16.22inch;  Weight 3.36lbs/1.601kg;    Package Included:  1*Solar panel;  4*DC connectors