Specollect Metal Detector - Electronic Wall Wood Metal Stud Finder Edge Center Beam Finders Stud Sensor with LCD Display for Detection Features: Sensor Scanner Depth: Detects up to 0.71 inches (18mm) , metal up to 1.2 inches (30mm), presence of live wire up to 3 inches (50mm) . 3 in 1 : Multi-scanner finder for Wood, Metal, AC Current. Quickly locates edges and center of wood ,wall studs, metal,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 indicating you the location of the edges of the studs. Easy to Use : battery installation,the unit is with a long beep,when auto power off,press TEST button for two seconds to turn on again.Auto power off without any . Compact design is easy to hold and use. Low battery indication. Battery:AAA 1.5Vx3（not included）. Specifications: Color: Blue,Red,Yellow,Green(optional) Material: ABS Battery Power: AAA 1.5V x3(not include) Detecting Depth: wood 30x30mm:≤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℃,