This product can detect the center position of wooden poles in the wall, and can also detect the position of metal and wires. 1. The stem profile with edge display function has three levels of detection: the first level can detect the stem center, the wall thickness is within 1/2 inch (13mm), the second level can detect the stem center valve stem, the wall thickness Three-range detection of stem centers within 1" (25 mm), wall thickness within 1 1/2" (38 mm). 2. This product can detect iron, lead, aluminum and other metals in the wall, and the detection range is within 2.36 inches (60 mm) of the wall thickness. 3. This product can detect live wires in the wall, and the detection range is within 2 inches (51 mm) of the wall thickness. 4. All detection functions have automatic correction function 5. All detection functions have AC warning function. 6. This product has LED display, which is convenient for reading data. Specification: Working temperature: 0℃-40℃ Applicable battery: 6F22 9V battery (not included in the product) Product size: 6.95*3*15.47CM. Product net weight: 146g. Wood maximum detection depth: 38mm. Maximum metal detection depth: 30mm. Maximum detection cable depth: 30mm. Storage temperature: -20-50°C. Color: yellow. Package Included: 1*Wall Detector (Battery not included). 1*English manual.