It is an ideal tool for DIY enthusiasts, professional electricians and users in the decoration field. Detect studs, metal, AC live wires, metal pipes, rivets or fasteners in the wall. Auto power off function. It will turn off without operation in 30 seconds and more energy will be saved. Quickly detect the center position, convenient to use. LCD display, can be easily read. Specification: Battery Power: 6F22 9V Battery (Not Included) Stud Detection Depth: 30*30mm Wood: 18mm Metal Detection Depth: Dia.25mm Iron Pipe: 30mm AC Live Wires: 90~250V AC Live Wire: 50mm Size: 155*72*28mm/6.1*2.8*1.1in Weight: 191g Package Included: 1 x Wood Wall Center Finder Note: This does not include other things, the color is based on the first picture, and other pictures only show the effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you!becomeveryrich