Four-in-one Depth Detection Function - The wall nail finder wall scanner has four different scanning modes, namely, wall nail scan, deep mode, metal scan and AC scanning. Backlit LCD display and audible warning - Multi-functional wall scanner sensor has a backlit graphic LCD display, which can display many clues during the detection process , such as detection mode, signal strength, automatic calibration, battery indication, audible warning, etc. Ergonomics - the tool has a soft coating grip, providing a firm and pleasant grip to guarantee a safe and comfortable handling, avoiding any slipping.The compact design, the device guarantees space-free storage in a tool bag. Automatic calibration - Once the post finder has found the material, the LCD will show the direction and intensity of the buzzer indicates if you are close to the target. With the auto calibration function, place it flat on the wall, turn on the power button, then press the "scan" button to start the calibration. When the beep and the on-screen display disappear, the calibration is complete. The edge of the stud will flash and beep. Ease of use - the device features an LCD screen that clearly and clearly displays the results for easy and intuitive reading. It beeps to alert the user when a live electrical cable is found. Features: Material: PC / ABS. Type of power supply: battery operated. Power supply: 1 9V battery (not included). Detects wood and metal nails: up to 38 mm. Dimensions: approximately 17.2 x 7.6 x 3.7 cm. How to find the stud? Calibrate the tool before each scan After choosing the mode, press and hold the scan button (on the right side of the tool) to calibrate this tool. Wait until the reduction bars have disappeared and beep to confirm that the calibration is complete If you accidentally shake or lift the scanner, the device needs to be recalibrated, in Metal / AC mode, put it in the air to calibrate it Scan the wall Once the stud finder finds the material, the LCD will show the direction and the intensity of the beep will indicate if you are closer of the target. Find the stud location When the signal bar is full and the audible alarm is the loudest, it means you have found the center of an object. Mark it with your pencil Package included: 1 Stud Finder. 1 Manual Note: this does not not include other things, the color is based on the first picture, and other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the color actual of the item. Due to manual measurement. Please allow deviation. Thank you!