Feature: 1. [Auto Calibration] Wall scanner auto calibration provides you with maximum reliability and accuracy. Easy to read LCD display, in stud/deep mode, place it on the wall you want to test for calibration; in AC/metal mode, place it in the breath for calibration. 2. [Sensor Technology] The stud detector wall scanner uses advanced sensor technology to accurately and quickly locate studs, wood, metal, and AC wires. 3. [LCD Display] When a substance is found, the LCD display will indicate the direction and the strength of the beeping sound to tell you whether you are approaching the target. Fast detection greatly saves the user's time. 4. [Quick Location] Wall stud finder can quickly and easily locate the wall, floors and ceilings behind wood metal stud beams, metal pipe threads and live AC wires. 5. [Scope of Application] Stud detectors quickly locate wood, metal and AC wires concealed in the wall, floors and ceilings of houses. This is a safe drilling tool that can help you avoid potentially serious problems when installing TVs, cabinets, etc. Specification: Item Type: Wall Scanner Material: Plastic Weight: Approx. 204g / 7.2oz Size: Approx. 17 x 7.5cm / 6.7 x 3.0in Battery Parameters: 1 Section of 9V Battery (Battery Not Included) Product Use: Detecting Wall Metal Current Wood 4 Scan Modes: Stud Scan, Depth Scan, Metal Scan, AC Scan Stud Scan: Approx. 19mm / 0.7in Deep Depth Scan: Approx. 38mm / 1.5in Deep Metal Scanning: Approx. 60mm / 2.4in Deep AC Scanning: Approx. 51mm / 2.0in Deep. Package List: 1 x Wall Scanner (Battery Not Included)1 x English User Manual Note: Battery Not Included