Metabo 18V 1/2" Sq. Impact Wrench 3.1Ah Kit COMPLETE PORTABILITY: Eliminate the cord, not the power The advanced and intelligent cordless technology, featuring AIR-COOLED charging, Electronic Single Cell Protection, Overload protection LiHD HIGH DENSITY BATTERY: The evolution in Li-Ion, amplifies the power transferred to the motor producing more runtime, more power, and longer life 4-LED CAPACITY INDICATOR: Shows battery charge status PATENTED AIR-COOLED CHARGER: Quickly cools battery allowing for up to 30% faster charge times while significantly increasing battery life