Features:  Functions: 4 in 1 stud finder is used to detect the center position of wood stalk, metal position and live wire in the wall of wood board and gypsum board materials  AC Warning: With AC warning function, it is convinient to use  Portable: The size is about 172 x 76 x 37mm/6.8 x 3 x 1.5inch, it is easy to carry  Application: It can be used to measure the center of the wood stem, measure the metal, measure the wire  Package: Our package come with a wall detector and a user manual    Specification  Material: PC, ABS  Color: Silver black  Size(L x W x H): About 172 x 76 x 37mm/6.8 x 3 x 1.5inch  Display: LED green backlight screen  Battery: 1PC 6F22 9V battery(not included)  Measure the center gear of wood stem: 1: 3/4 in. (19mm) IL: 11/2 in. (38mm)  Measuring metal gear: 2.36 in. (60mm)  Live wire inside measuring wall: 2 in. (51mm)    Package included:  1pc x Wall Detector  1pc x User Manual