Stud Sensor Overall Height 9 in Batteries Required Batteries Required (Included) Overall Width 5 1/4 in Materials Detected Ferrous Metal Non-Ferrous Metal Wood Battery Type 9V Scan Depth for Ferrous Metal - Maximum 1/4 in Scan Depth for Wood - Maximum 1/4 in Compatible Surface Material Drywall Scan Depth for Live Wire - Maximum Not Applicable Scan Depth for Non-Ferrous Metal - Maximum Not Applicable Display Type LED Indication Method Visual Stud Finder Type Electronic