No Batteries Required: Stud Finder Wall Scanner has rare earth magnetic with a 27 lb pull, so it doesnt need batteries. It is easy to use and very practical. High Accuracy: You can use our Magnet Stud Finder to quickly and accurately detect screws or nails behind wood-framed walls or drywall. It is very convenient. Precise Positioning: There is no need to make any marks or read data on the wall, our Stud Detector can be directly positioned and fixed in an accurate position, and the construction can be carried out directly. More Functionality: Stud Ball Finder can easily detect metal through drywall, wood framing, or other thicker construction materials up to 5/8". It also can pass up to 3/4" tile and plywood paneling. Multiple Uses: You can use our Wall Stud Finder to find some small metal objects that fell on the ground or to pull up metal objects that fell into gaps. Specification: Color: Red Weight: 27g Size: 8.8*2.1*1.9cm Package includes: 1pc*Stud Finder Notes: 1. Due to the different display and lighting effects, the actual color of the product may be slightly different from the color shown in the picture. 2. Due to manual measurement, please allow a measurement deviation of 1-3cm.