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