Features: 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:WallScannerMaterial:PlasticWeight: Approx. 204g / 7.2ozSize: Approx. 17 x 7.5cm / 6.7 x 3.0inBattery Parameters: 1 Section of 9V Battery (Battery Not Included)Product Use: Detecting Wall Metal Current Wood4 Scan Modes: Stud Scan Depth Scan Metal Scan AC ScanStud Scan: Approx. 19mm / 0.7in DeepDepth Scan: Approx. 38mm / 1.5in DeepMetal Scanning: Approx. 60mm / 2.4in DeepAC Scanning: Approx. 51mm / 2.0in Deep Package List: 1 xWallScanner(Battery Not Included)1 x English User Manual Note: Battery Not Included