1. Wide Detection Range - The maximum detection area for metal parts is 3 inches (3 inches), bolts 5 cm (2 inches). Simply find the center and edges, accurately locates metal tubes, live wire studs, wooden frames, beams hidden behind walls, floors or ceilings. 2. Find the Center: The warning flag with AC wire will display on the LCD screen when the live wires are monitored. Three detection modes indicate the intensity, the proximity of the wood studs, the center, the highest column is the center and the Studs beep will remind you when you have reached the destination. 3. Calibration - Before detection, please hold the scan button for 1-2 seconds. and it is calibrated. The beep will remind you when you have finished your work. You may need to recalibrate your device if the button was accidentally unlocked at first, or you think it is necessary during the process. 4. Excellent Screen Backlight - The LCD backlight provides a clear look even in low light conditions and displays the