This Floureon 3 in 1 Stud Center Finder ,Metal and AC live wire detector is a good helper when you decorate your home. It can avoid unnecessary losses when you want to dig a hole to hang a picture or install shelves and so on by locating hidden metal pipes, live wire,stud and wooden frames accurately. It has 3 detector modes: 1.Stud Scan Mode: locates the edge of metal and wood stud in normal walls up to 1.5 inch (38mm) 2.Metal Scan Mode: locates the metal such as iron.copper and aluminum pipe up to 3 inch(76mm) 3.AC Wire Scan Mode: locates the AC wire up to 3 inch(76mm) This detector comes along with a audio and visual indication which allows you to make a mark easily when the metal .AC live wire and stud is detected.And the LCD screen is easy to read for the backlight. FEATURES: Easy to find the stud cent Accurately locates hidden metal pipes, live wire,stud and wooden frame Detects metal up to 76mm dept Detects voltage up to 76mm dept Detects wood and metal stud up to 38m LCD screen with backligh Auto calibration metal, voltage and stud detectio Audio and visual indication(Beep sound reminding and easy-read LCD display Auto shut off functio Operated by one piece of 9V battery (battery not included) Specifications: 3 Detector modes : Stud Scan Mode, Metal Scan Mode and AC Wire Scan Mode Detects metal up to 76mm dept Detects voltage up to 76mm dept Detects wood and metal stud up to 38m Color :yello Operating temperatue/humidity: -20° to 50 Power supply: 1*9V battery(not included) PACKAGE: 1* Floureon 3in1 detector 1* User manual