Using the Makita CLX228AJ Combo Kit is easy. First, charge the batteries fully before your first use. To operate the combi drill, insert the appropriate drill bit into the chuck, set the torque and speed according to the material you're working on. For the impact driver, insert the right driver bit into the 1/4' driving shank. When using, keep your work area well - lit with the LED light. Always wear safety goggles to protect your eyes from debris. Don't use the tools in wet conditions. For maintenance, after each use, wipe the tools clean with a dry cloth. Check the batteries regularly and store them in a cool, dry place. If you notice any damage to the tools or batteries, stop using them immediately and contact Makita's customer service.