20000mah Double USB Ultra Thin Portable External Battery Charger Power Bank Compatible with Mobile Cell Phone- Black Capacity: 20000mAh Dimensions: 6 x 3 x 0.4 inches (L x W x H) Easily slips into a pocket, you can bring it to anywhere, very convenient to use it to charge your smart devices. Aluminum casing Product of GEARONIC TM, Trademark Registered.