Using the DeWalt DCD999B is easy. First, make sure you've inserted a compatible DEWALT® 20V MAX* or FLEXVOLT® battery. Attach the 360° side handle for better control if you need it. Select the appropriate speed on the 3 - speed transmission according to your task. When using the drill in dark or confined spaces, turn on the 3 - mode LED. Remember, in spotlight mode, it will shut off after 20 minutes, so you can reset it if you need more light. For bit changing, use the heavy - duty 1/2 - inch ratcheting nitro - carburized metal chuck. When it comes to maintenance, keep the drill clean after each use. Wipe it down with a dry cloth. Check the battery regularly and store it in a cool, dry place. If you want to use the Tool Connect™ feature, install the Tool Connect™ Chip DCE042 (sold separately) in the chip pocket and connect it to the Tool Connect™ Site Manager app. Always follow the safety instructions provided in the user manual to avoid any accidents.