550n.m high torque & brushless motor: the impact wrench provides a maximum torque of 406 ft-lbs (550n.m), making it the cordless impact wrench with the highest torque on the market. this heavy duty impact wrench effortlessly loosens or tightens different types of screws or nuts, e.g. when removing car tires, assembling furniture, installing scaffolding, in the garage, diy projects, etc. 4.0 ah battery & 1h fast charging: heavy duty electric impact driver with 4000mah large capacity batteries. compared to 2.0ah batteries, the autonomy has been increased by 50%, say goodbye to frequent battery changes and improve work efficiency. high torque impact wrench reduces charging time to 1 hour, saving charging time. with a power indicator, easily check the remaining power 3 adjustable speed: the 1/2 impact wrench has a ground switch, supports 3 speeds of 0-1990/2200/2800rpm adjustment to meet different working needs, improve efficiency and save battery power. it can also be adjusted clockwise or counterclockwise by pressing the side button. in case of reverse rotation, a press on the switch can trigger the brake stop function, so you don't have to worry about your nuts/bolts falling or damaging after loosening them lightweight and compact: robustrue 1/2 cordless impact wrench weighs only 1.6 kg with battery, compact (5.9 inches front to the back) design with a top motor minimizes fatigue in most daily tightening or loosening tasks, friendly for all women, elderly users, the handle is ergonomically designed, comfortable to hold two directions and reverse auto off mode: this 1/2 cordless impact driver with forward and reverse gear. in reverse mode, as soon as the nut or bolt is loosened, the brake stop device is activated and reduces the speed and torque to prevent the nut from falling and protect the screw thread built-in led light & softer trigger pressure: the electric impact wrench has built-in led work light, it lasts about 20s after releasing the trigger, helps you work in extremely dark or narrow environments. as soon as you press the trigger, you will be impressed by the softness of the contact. impact wrench sensor system detects the finest pressure changes, allowing for more precise speed control important: only come with one battery