Product Description: Quantity: one set Specifications: 1. Quickly detect the center position of the rod 2.LCD display, easy to read 3. Wood and metal rods detectable, within 1 1/2 inches (38 mm) wall thickness 4. Can detect metal pipes, wall thickness less than 3 inches (76 mm) 5. It can detect live wires in the wall and the thickness of the wall is less than 3 inches (76 mm) 6. All detection functions have an automatic correction function 7. Works with one 6F22 9V battery (not included) High sensitivity wire detector: AC wire warning flags will appear on the LCD whenever live wires are monitoring in three detection modes. The Exposure Column will rise as the center of the stud finder's approach element, and the tallest column site will be the center of the studs. The beep sound will remind you when you find the target. AUTO CALIBRATION: Before detection, please hold down the scan button for 1-2 seconds, and wall mounted metal detector will be calibrated. The beep sound will remind you when the job is done. You may need to recalibrate your material detector if the button was accidentally released at the start or if you think it needs to during the process. EXCELLENT BACKLIGHT SCREEN: Metal detector has features with LCD backlight, providing a clear look even in low light conditions, indicating detecting mode, center pointing, low battery indication. Audio indication, with beep sound to remind. ERGONOMIC DESIGN: Designed with soft grips to provide comfort and better tool control. EASY TO READ: It is equipped with a green backlit screen, an audible beep and a visual indicator for precise detection.