Stud Finder, 3 in 1 Multi Scanning Wall Sensor With Sound Warning For Wood Stud/AC Wire/Metal Detector MEET ALL YOU NEED. Package includes : 1x stud finder , 1x 6F 9V battery and 12-month warranty and lifetime friendly. It is light weight and has ergonomically designed one-key-operate handle. 3 in 1 detection. With automatic calibration for easy and precise detection, there are three modes to select : wood studs, metal objects (rebar, studs and steel/copper pipes) and live wiring. High Efficiency. The easy-to-read LCD screen accurately displays what type of stud you are looking for as well as its position and the battery status of the device. Accurate Detector Technology. This stud finder can locate center of wood studs up to 3/4-Inch (19 mm) deep, metal studs up to 11/5-Inches (30 mm) deep, Wire Warning detection indicates the presence of live wire up to 2". Easy to use. Only two buttons ,first select the probe type ,then just press and hold the side button and scan horizontally across the object surface. Auto power off without any operation after 60 seconds .v