Features: Detects stud up to 0.71 inches (18mm), metal up to 1.2 inches (30mm), presence of live wire up to 3 inches (50mm). Easy to Read : LCD digital display screen, easy for you to read, also with the continuous sound warning indicating you the location of the edges of the studs. Easy to use: you can use it after you put the battery into the detector(battery not included), then turn on the detector to use, which is easy and convenient. Compact design, also small in size, so you can take it with you to anywhere you want to use it. 3 in 1 function: Multi-scanner stud finder for wood, metal, AC current. also can quickly locates edges and center of wood ,wall studs, metal pipes, wooden joist and can indicates the presence of live AC wire.