UL certified – Grade A Lithium-ion rechargeable battery – Includes key ring on one end – Overcharge, over discharge, overload and short circuit protection – Capacity: 2200 mAh – Input: DC 5V/500mA, Output: DC 5V/1000mA – Includes micro USB charging cable – Instructions included and individually boxed . 1″ W x 4″ H x 0.875″ D