1. The new 5-in-1 design is more powerful, more accurate and more durable.   2. This product can quickly and easily locate the wooden metal studs, joists, metal pipe reinforcement and live AC wires behind walls, floors and ceilings.   3. The alarm design allows you to always know the situation of the wall and make the operation more accurate.   4. SH402 wall detector can clearly identify what objects are inside the wall, which is more intuitive and accurate. Wood detection, metal detection, current detection.   5. It has a wide range of applications. You can use it whenever you want to view the interior of an opaque object.      Use upgraded internal sensors. It can sense the change of space density behind the wall and locate the center of the stud very accurately.   Model:SH402   Net weight of product:170g   Alarm mode:beep   Battery type:9V dry battery (delivered without battery)   Display:LED LCD green backlight screen   Colour:Silver   Material:ABS   Size:17.1x7x3.5cm      Package Contents:   1 * SH402 detector