This stud finder is actually way more useful than I expected - it's become my go-to tool for any hanging projects around the house! It can detect both wood and metal studs up to 3/4 inch (20mm) deep, which covers most standard drywall situations. Using it is super simple - you just press the button, it beeps for 1-2 seconds while calibrating, then when the green power light stays on, you're good to start scanning. You keep holding the button and slowly slide it across the wall until it detects the edge of a stud. It has both LED light indicators and audio beeping - the lights show you the direction, and the beeping gets more intense as you get closer to the center of the stud. The ergonomic grip makes it comfortable to hold from any angle, and it's compact enough (5.78 x 2.44 x 1.26 inches) to store in a toolbox or drawer. It runs on a standard 9V battery (not included), which is easy to find anywhere. One pro tip - when calibrating, make sure to take off any rings or metal jewelry since that can interfere with the calibration. Whether you're hanging pictures, mounting a TV, installing shelves, or doing any kind of renovation work, having a reliable stud finder prevents so many mistakes and damaged walls. This one is accurate enough for DIY projects but still affordable. The package includes the stud finder and user manual - just grab a 9V battery and you're ready to start finding studs like a pro!