Using your Milwaukee M12 FUEL 3/8 Stubby Impact Wrench is a breeze. First, make sure the M12 REDLITHIUM battery is fully charged and properly inserted. Then, select the appropriate mode on the 4 - Mode Drive Control based on your task. For precise work, use the 1 - 3 RPM setting. When reassembling, the Auto - Shut Off Mode will stop the tool once the bolt is tightened correctly, preventing over - fastening. When working in tight spaces, take advantage of its 4.8 - inch length for easy access. As for maintenance, keep the tool clean and dry. After each use, wipe it down to remove any dirt or debris. Periodically check the battery for proper charging and storage. If you notice any issues with the tool, such as a decrease in torque or strange noises, it's best to have it checked by a professional.