With the YOUWE 21 impact wrench, tightening and loosening nuts and bolts becomes a breeze. It can easily and quickly remove rusted or over-tightened nuts and bolts. Can be used for automotive repair, construction projects, heavy equipment maintenance, etc. Variable speed trigger achieves the desired speed by pressing the trigger hard, and the direction can be changed by simply pressing the conversion switch. Built-in LED light illuminates the work area to improve visibility in the dark Double battery capacity, the upgraded electric impact wrench is equipped with a 4.0 Ah battery for extra-long cordless running time, can be quickly fully charged in 2 hours, equipped with sufficient safety protection