This is a portable power source for everyday use. The Biolite Charge Series features an ultra thin and durable stainless steele design to bring you power that cross over from the outback to everyday. The silicone gasket makes the Charge 20 dunk proof, ready for spills or unexpected rain. Its 5200 mAh power supply can charge 2 full phones, lights, fitbits, or any other gear you need to carry.