The wall detector can detect metals(magnetic and non-magnetic), wood and live cables hidden in walls, ceilings and floors (the wall, ceilings and floors refers to concrete, tiles and boards.) Features: 4 Depth Range Class: automatic material classification classifies magnetic metal(8cm), non-magnetic metal(5cm), AC cable(5cm), and wood(2cm) for accurately location. Big Sensor: adopts with high sensitivity sensor to improve the detecting accuracy. Dual Alarms: indicator light change to red and buzzer sounds up once detecting metals. 3 Indicators Lights: according to the strength of the detected metal, the indicator light changes among red(strong metal signal), green(no metal) and orange(weak metal signal). Large Display Screen: 2.2-inch large LCD screen with backlight display the measured data clearly and intuitively. IP65 Protective Grade: protect the detector from dusty environment, suitable for various working conditions. Fluff Pad Design: 2pcs fluff pads increase the flatness of the detector thus enhance the stability during detecting. Specifications: Material: ABS Display: 2.2 34; LCD screen with backlight Depth Range: Magnetic metal: 8cm Non-magnetic metal: 5cm AC cable: 5cm Wood: 2cm Units: cm/in Non-metal Detection: Yes Metal Detection: 20mm standard steel bar depth value is the most accurate; other metal depth values are for reference Live Detection: 50/60Hz AC With Magnetic Detection: Yes Auto Backlight Shut-off: 10s Working Temperature: 0~50 Storage Temperature: -20~70 Protection Class: IP65 Sound Source: Buzzer Power Supply: 3 * 1.5V AAA battery (NOT included) Item Size: 149 * 70 * 30mm / 5.87 * 2.76 * 1.18in Item Weight: 150g / 5.29oz Package Weight: 299g / 10.55oz Package Size: 24 * 15 * 5cm / 9.45 * 5.91 * 1.96in Packing List: 1 * Stud Finder