1、High Torsion: The maximum torsion of this impact wrench is 550N.m (406ft.lbs.), which helps you effortlessly loosen or tighten various types of bolts or nuts, including dismantling car tires, assembling furniture, installing scaffolding, garage use, etc. 2、Battery Powered: This cordless impact wrench is powered by two 21V 4000mAh batteries, which have a longer operating time, short charging time, and high work efficiency. Use the power indicator light to easily check the remaining battery level. 3、Easy Adjustment: Can be adjusted by rotating the side button clockwise or counterclockwise. When rotating in reverse, pressing the switch button can trigger the brake stop function, without worrying about the nuts and bolts falling off or being damaged. 4、Multifunctional Design: This cordless tool is a multifunctional design that can be served as an impact wrench, impact drilling rig, and electric screwdriver to meet different needs and suitable for different working environments. 5、Other Functions: This electric wrench has built in LED work light that can hold for about 20 seconds after releasing the trigger, suitable for dark or narrow environments. The sensing system can sensitively recognize subtle changes in pressure, thereby achieving more accurate speed control. Item Type: Electric Impact Wrench Material: ABS Battery: 2 x 21V Battery, Capacity: 4000mAh x 2 (included) Maximum Torsion: 550N.m Speed: 0-3400r/min Standard Bolt M5-M12, High Strength Bolt M5-M10 1 x Electric Wrench 1 x Adapter 2 x Battery 1 x Screwdriver Bit