Using the DeWalt DCF845D1E1 impact driver is easy. First, charge the batteries using the included charger. Once charged, insert a battery into the driver. Select the appropriate speed on the 3 - speed switch according to your task. For smaller screws or more delicate work, use a lower speed. For larger diameter screws, switch to a higher speed. The variable - speed trigger gives you even more control over the driver's operation. When working in low - light areas, turn on the 3 - LED work light to illuminate your workspace. Remember, the chip for tool tracking is sold separately. If you choose to use it, install it as per the instructions in the DEWALT TOOL CONNECT Site Manager App. As for maintenance, keep the driver clean by wiping it down after each use. Avoid using it in wet or extremely dusty conditions. Periodically check the batteries for any signs of damage. If the battery is damaged, replace it immediately. Also, store the driver in the included kit bag when not in use to protect it from bumps and scratches.