Using the Bosch D - Tect 120 is a breeze. First, insert the four AA batteries that come with it into the scanner. Then, turn it on. You can choose from three modes: drywall, universal, and concrete, depending on your job. Just place the scanner on the wall, panel, or floor, and it will use Spot Detection technology to quickly find objects. It'll make a sound and show a light when it detects something. There's no need to calibrate it, so you can start right away. When using it, make sure the surface is clean and dry for better results. Don't expose it to extreme temperatures or moisture. After use, put it back in the hard carry case to protect it. Keep the batteries fresh for consistent performance. And that's it! You're all set to use this great detector for your professional projects.