Check the listing for details. Stud Finder, 5 in 1 Multi-Function Wall Stud Sensor Detector with LCD Display. Color: Yellow/Green, Condition: New. Listed at 22.99 USD. Stud mode indicationAC mode indicationMetal mode indicationStud 1/2 in. scanStud 1 in. scanStud 1-1/2 in. scanMulti-Function Wall Stud Sensor DetectorMulti-Function Wall Stud Sensor DetectorStud finder is a easy-to-use, also a necessary tool that quickly locates the edges of wood and metal studs and joists behind walls, floors, and ceilings etc.This stud finder operates by slowly slide device horizontally across wall, right of left. When full bars appears on the LCD and steady tone sounds, you have located the edge of the stud.Battery installation 1.Open battery door on back of case. 2.Connect a 9-volt battery to battery clip. 3.Insert battery into case and replace battery door.Easy To UseOnly three buttons, first press ON/OFF button, then select the probe type ,after that just press and hold the “Scan button”(at the left side of the device) and scan horizontally across the object surface. Auto power off without any operation after 60 seconds.LED Digital ScreenLCD with digital display and continuous sound warning indicating you the location of the edges of the studs.makes home improvement projects much easier.Include The BatteryCompact design is easy to hold and use. Low battery indication. Battery :1 x 9 V battery(included).