①. 【5 in 1 Function】 The wall detector has 5 different scanning modes. Three beam modes scan wooden beams and studs in walls up to 13mm, 25mm and 38mm thick. Metal mode detects metal up to 60mm deep. AC scan mode detects unshielded cables up to 51mm deep. ②. This power line detector is equipped with sensors. When you pull this wall scanner away from the wall, the indicator on the LED screen will show a clear direction and exact target location, and a beep will notify you. The object has been detected. You can find wood, metal posts, rebar and wires carrying current behind walls, floors and ceilings. ③. The power/mode selection button and calibration button make it easy to calibrate and use the beam finder calibration. In climbing mode, just calibrate on the wall; In metal and AC mode, calibration is done in the air. Perform calibration in a place where there are no nearby posts or AC wires. Proximity. ④. This power line detector is suitable for professional applications such as construction and industry, and also makes DIY work easier. It is easier and safer at home. It will help you avoid drilling holes in the wall for metal and AC wires when drilling holes in the wall, hanging artwork, installing a TV or installing a ceiling light. Note: The wall-mounted metal detector is not included. With 9V battery.