Features: Accurate and fast: stud detector uses an intelligent microprocessor chip with highest sensitivity to accurately and quickly detect wood, pipes, metal and AC wires hidden in walls. 5-in-1 multi-functional detection: 5 scanning modes including ½ in, 1" and 1½ in scanning modes to locate center and edges of wood, beams, joists, metal or deeply buried objects; metal scanning mode to detect ferrous and non-ferrous metals to a depth of 2.36 inches; AC scanning to detect unshielded 80 to 240 AC voltage lines to a depth of 2 inches. Automatic calibration, easy to use: Turn on stud finder, lay it flat on wall, press scan button, and it's ready for calibration. smart sensor chip flashes and beeps when hidden wood, metal and AC lines are found. LCD display and audible warning: signal bar on LCD display alerts you to distance and direction of approaching objects and beeps to determine location. This LCD display is also backlit which can provide clear display even in low light conditions. Wire warning indication: When you scan in stud scan/depth scan/metal scan mode, wire warning stays on to alert you to presence of live AC , which helps you hazards when installing TVs, bathroom cabinets, picture frames, and garage shelves. Specification: Color: black\orange Material: abs supply: 9V Battery type: 9V battery 6F22 ( not included) Product size: 15.2 * 6.2 * 2.8cm Package size: 16 * 7.8 * 4.5cm Package weight: 168g Packing List: 1 * Wall Scanner