Stud Finder, Accuracy +/- 0.15 in, Overall Height 3 5/16 in, Batteries Required Batteries Required (Not Included), Overall Width 7 1/2 in, Overall Depth 3 3/8 in, Materials Detected Live Wire, Ferrous Metal, Plastic, Wood, Battery Type AA, Scan Depth for Ferrous Metal - Maximum 2 in, Scan Depth for Wood - Maximum 1 11/16 in, Compatible Surface Material Drywall, Scan Depth for Live Wire - Maximum 1 11/16 in