Using this Klein impact wrench is easy. First, make sure you have a fully - charged DeWALT 20V lithium - ion battery installed. Select the right bit for your task and insert it into the 7/16 - inch quick - release chuck. You can control the speed using the variable speed trigger according to the material you're working on. For softer materials, use a lower speed, and for harder ones, you can increase it. When you're done, always use the safety lockout switch to prevent accidental starts. Keep the tool clean by wiping it with a dry cloth after each use. Store it in a cool, dry place. If the battery runs low, charge it using a compatible charger. Don't expose the tool to extreme temperatures or moisture, as this can damage the internal components and the battery.