The SOLARPACK is ultra-compact yet a powerful solar panel that enables you to charge your portable devices directly from its USB and 12-volt DC charging ports. The SOLARPACK allows you to charge the POWERPACK (sold separately) in just 6 hours of sunlight. It also charges your USB and DC devices very quickly with it's built in smart chip. The smart chip also allows for the device to automatically start charging your device when the unit is put back in the sunlight. It uses 12 watts of highly efficient solar technology and it has dual solar panels to provide plenty of power. It folds easily into a small, lightweight portable case. If you're backpacking, hiking, biking, skiing, or camping, you can easily pack and carry your solar energy with you. It can easily be hung on your backpack during these activities. The SOLARPACK can charge most of your portable devices to help you keep your digital life up and running. Don't worry about rain or snow the SOLARPACK is waterproof.