Stud Sensor, Accuracy +/- 5 mm, Overall Height 1 1/2 in, Batteries Required Batteries Required (Included), Overall Width 3 9/16 in, Materials Detected Ferrous Metal, Live Wire, Wood, Battery Type 9V, Scan Depth for Ferrous Metal - Maximum 1 1/2 in, Scan Depth for Wood - Maximum 1 1/2 in, Scan Depth for Live Wire - Maximum 2 in, Features Auto Calibration, Ergonomic Design and Soft Grip Buttons, Marking Channel Helps Improve Accuracy of Marking-Out Readings