3 in 1 : Multi-scanner stud finder for Wood, Metal, AC Current Features: Stud Sensor Scanner Depth: Detects stud up to 0.71 inches (18mm) , metal up to 1.2 inches (30mm), presence of live wire up to 3 inches (50mm) . Quickly locates edges and center of wood ,wall studs, metal pipes,wooden joist ,rebar behind walls, floors and ceilings, also indicates the presence of live AC wire . Easy to Read : LCD with digital display and continuous sound warning indicating you the location of the edges of the studs. Easy to Use : After battery installation,the unit is turned on with a long beep,when auto power off,press TEST button for two seconds to turn on again.Auto power off without any operation . Compact design is easy to hold and use. Low battery indication. Battery:AAA 1.5V*3?not included?. Specifications: Color: Blue,Red,Yellow,Green(optional) Material: ABS Battery Power: AAA 1.5V*3(not include) Stud Detecting Depth: wood 30*30mm:?18mm Metal Detecting Depth: Iron Pipe 25mm:?30mm AC Live Wires?AC 90-520V live wire?5cm??frequency at 50-60Hz Operating Temperature and humidity: -7?-40?,