ALLOSUN Wood Stud Finder Electronic Sensor Wood Stud/Metal Detector/AC Electrical Scanner 3 in 1 Multi-Scanner TS79 Power supplied by 1 piece 9V (6F22) battery. (Battery not provided by seller) 3 in 1 mutiscanner can be used to detect and locate stud, metal, AC wires . The detection depth as following: Wood stud of 30*30mm:18mm;Iron pipe of 25mm:30mm; When detects an object, the spotlight appears and mark in the groove position. LCD and sound signal indicate findings. Stud mode Wood stud of 30*30mm:18mm Metal mode Iron pipe of 25mm:30mm Voltage mode Typical depth of 50mm for 90 to 250V at 50 to 60Hz. all-sun 3 in 1 multiscanner x 1 illustrated English Manual x 1 all-sun Professional Specially-made Package