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[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. 3[Sensor Technology] The stud detector wall scanner uses advanced sensor technology to accurately and quickly locate studs wood metal and AC wires. 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[Lightweight and Portable] Wall scanner is light in weight small in size easy to carry and store convenient and quick to use and stable in performance. Specification: Item Type:WallScannerMaterial:PlasticWeight: Approx. 205g / 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