Using the Milwaukee M18 FUEL 3/8 Compact Impact Wrench is easy. First, make sure your REDLITHIUM battery is charged. If you want to use the ONE - KEY feature, connect your tool to your smartphone via the app. You can choose a preset set - up according to the fastener and material you're working with, or set the output speed and power on your own. Once you're satisfied with the settings, save them in the tool's memory. When using the tool, keep an eye on the load. The REDLINK PLUS Intelligence will protect the tool and battery from overloading or overheating, but it's still good to avoid extreme situations. For maintenance, after each use, clean the tool with a dry cloth. Check the battery regularly for any signs of damage. If you're not using the tool for a long time, store it in a dry and cool place. Don't forget to keep the included belt clip and bit holder in a safe place so you can use them whenever you need.