Stud Finder 3 in 1 Wall Wire Detector Electronic Stud Sensor Wall Scanner Center Wood Finding Metal Studs AC Wire This device is a 3 in 1 metal/voltage/stem detector. It uses electronic signals to locate the exact position of studs, ceiling AC wires, and metal through drywall, concrete, and other common wall materials. When the edge of the pin is detected, it emits audible and visual signals (LCD display) that allow you to easily indicate its center position. This device is an ideal tool for DIY fans, professional electrician and users in the field of decoration. Function Description 1. Choose 2 studs. Metal Detection 3. Detect the AC Live wires 4. Using metal detection function to find hidden metal pipe, rivet or fixture in the wall 5. Auto Power Off (No Operation 3 Minutes) Specification Battery Power: AAA 1.5V 3 (Not Included) Stud Detection Depth: Wood 30*30mm: lt; 18mm Metal Detection Depth: Phi lron tube; 25mm: lt; 30mm AC Live Wires: AC Live Wire 90 - 250V (5cm), Frequency at 50 - 60Hz Operating Temperature & Humidity: -7c - 40C, lt; 75% Storage Temperature & Humidity: -20c - 50c, lt; 85% Size: 155(L)*72(W)*28(H)mm Weight: About 203g (including battery) Package Included: 1*3 in 1 Metal Wall Scanner with Voltage Detector