Product details Battery Cell Type: Lithium battery. Capacity: 20000mAh. Rated Input: DC 5.0V/2A. Rated Output: DC 5.0V 2.1A Max. Dimension: 135.7*67.3*15.5mm.Optimized Portability: Light and slim, with easy-grip edges—taking extra power anywhere has never been easier.Massive Capacity: 20000mAh high capacity, filled to the brim with power. Never worry about dead phones again.