FOLAI Finder Wall Scanner - 4 in 1 Electronic Detector Multi-Function Stud Sensor Digital LCD Display, H15, Graphical LCD DisplayThe Wall Scanner has LCD with graphical display and continuous sound warning.such as detection mode, signal strength, automatic calibration, battery indication with maximum readability.And the low battery indicator icon can be displayed when the battery level is getting low. Seller Warranty12-Month Replacement Warranty and 30-Day Money Back Guarantee.Lifetime Support Guarantee.The stud finder is light weight and has ergonomically designed one-key-operate handle. " Stud Center FinderThe Multi-Function Wall Scanner can quickly locates edges and center of metal studs, pipes, rebars, joists behind walls, floors and ceilings, also indicates the presence of live AC wire.