Detailed description: 5 in 1-The digital wall scanner has 5 scanning modes, includes 1/2", 1" and 1-1/2" scanning mode to locate the center and edge of woods, beam, joist, metals or deeply embedded objects. Metal scanning mode to detect ferrous and non-ferrous metal up to a depth of 2.36”; AC scan detects unshielded AC voltage lines up to 2”. Accurate & Rapid-The stud finder adopts intelligent micro-sensor chip with highest sensitivity, which can accurately and quickly find edges and center of metal, studs, joists, pipes, live AC wire behind walls, floors and ceilings. LCD Display & Audio Alarm-This stud finder comes with LCD display and sound alarm, which can detect the exact location of the objects. When find the objects, the intensity of beeping tells whether you are more close to the target. Easy to Use-Turn on the stud finder, lay it flat on the wall, press the scan button and it is ready for calibration. When the wood, metal and AC wires hidden is found, the intelligent micro-sensor chip will flash and beep. Wide Application-This wall detector can work on different wall surfaces, such as lath, wallpaper wood flooring, acoustic ceiling, painted walls, etc. It helps you avoid danger when installing TVs, cabinets, garage racks, etc. Note: Please allow 1-3cm measuring deviation due to manual measurement. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Product name: Wall Scanner Material: ABS / electronic components Size: 152 x 62 x 28mm / 6 x 2.4 x 1.1 in Color: black, yellow (optional) Battery type: 9v battery 6F22 (not included)