Function Description 1.Detect STUD 2.Detect metal 3.Detect AC Live Wires 4.Using metal detect function to find hidden metal pipe,rivet or fixture in the wall 5.Auto power off (No operation 30 seconds ) Specification Battery power :6F22 9V battery(the battery is not include) Stud Detecting depth:Wood 30*30mm:18mm Metal Detecting depth:iron pipe 25mm:30mm AC live Wires:AC 90~250V live wire(5cm),frequency at 50~60 Hz Operating temperature & humidity: -7C ~ 40C, <75% Storage temperature & humidity: -20C ~ 50C, <85% Size: 155(L)* 72(W)* 28(H) mm Weight: about 203g Know The Apparatus: 1.This unit is 3 in 1Metal/Voltage/Stud Detetor. 2.It uses electronic signals to locate the exact position of studs,ceilling joist AC wires and metal through 3.For Drywall,concrete and other common wall materials .Once the edge of a stud has been detected ,it emits audio and visual signals (LCD Display) that allow you to easily pinpoint its center position .