Features: 1. Multi-function: Metal-wood stalk center detector with metal and voltage detection function. It is used to detect the central position of metal or wood stems in the wall, and can also detect the metal and voltage functions in the wall, whether the wires in the wall are live, etc. 2. Quickly detect the center of the stem. And LCD display, easy to read. 3. Can detect wood metal stems, detect metal pipes, detect the live wire in the wall. 4. All detection functions have automatic correction function. 5. Power supply: Operated by 1pcs 9V battery (not included). Notice: 1. Actual color may be slightly different from the image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement. Specification: Type: Wall Stud Finder Size: 15x7x3cm Display: LCD display, easy to read For detect wood metal stems: the wall thickness is within 1 1/2 inches (38 mm). For detect metal pipes: the wall thickness is within 3 inches (76 mm). For detect the live wire in the wall: the wall thickness is within 3 inches (76 mm). All detection functions have automatic correction function. Power supply: 1 x 6F22 9V battery(not included) includes: 1 x Wall Stud Finder