Keep your gadget's batteries in optimum working condition with this portable power bank. It has 2200mAh battery capacity with Lithium Ion Grade A non-recycled battery. It is UL Listed and one of its integral components is a USB output port which is capable of delivering 5V/0.8A of power which is actually really impressive and makes for faster charging. It also has split ring attachment for attachment to backpacks, belt loops etc. Complies with UL. 3.625" L x 0.87" W x 0.87" H