Wall Scanner LCD Green Backlit Screen Cordless Highly Accurate Stud Finder with Intelligent Microprocessor Chip for Metal Wood 1ACCURATE AND FAST: Using a highly sensitive intelligent microsensor chip, it is able to accurately and quickly detect the edges and centres of metal, columns, joists, pipes and live AC wires behind walls, floors and ceilings. The fast and accurate detection saves the user's time and effort and makes the task easier to complete. 2CORDLESS PORTABLE: No cables, compact size and easy to carry. Users can use it anytime and anywhere without worrying about cables. Prevent accidental shocks and ensure electrical safety in your home. 3INDICATION SIGNAL: Equipped with LCD green backlit display and sound indication, users can clearly understand the detected thickness. 4AUTO CALIBRATION: With auto calibration function, which can automatically calibrate all the detected objects with high detection accuracy. 5LOW BATTERY INDICATOR: Meanwhile, when the battery is low, the detector will have a warning display to remind the user to charge the detector in time.