Using the DeWalt DCG426M2 is a breeze. First, make sure the batteries are fully charged using the DCB115 charger. Then, insert a battery into the die grinder. To set the speed, use the three - speed selector switch to choose a general range, and then fine - tune it with the variable - speed rocker switch. When you're working, the 3 - LED light ring will help you see what you're doing clearly. Always wear safety goggles and other appropriate safety gear. Keep the tool clean and dry. After each use, wipe it down with a dry cloth. If the tool gets dirty, use a mild detergent and a soft cloth. Don't immerse the tool in water. Store the tool in the provided kit bag when not in use. Also, avoid over - tightening the wrenches when attaching or detaching accessories. This will help keep the tool in good condition and ensure its long - term performance.