Using the Milwaukee M18 FUEL™ 3/8 Mid - Torque Impact Wrench is straightforward. First, make sure you have a compatible M18™ battery (not included). Insert the battery into the tool. Then, select the appropriate mode on the 4 - Mode DRIVE CONTROL™ according to your task. For normal fastening, you can choose a lower mode. If you need to remove stubborn bolts, a higher mode might be better. When using Mode 4 for hand - tight fastening, it'll automatically shut off to prevent overtightening. And when removing bolts, it'll slow down after the bolt is loosened. Be careful when using it in tight spaces, make sure there's no interference. Also, don't use it in environments above 69kV. To maintain the tool, keep it clean after each use. Wipe off any dirt or debris. Store it in a dry place. Periodically check the Tri - LEDs to make sure they're working properly, as they're important for visibility. And always follow the safety instructions in the user manual.