Quickly find the metal, wood, AC wire that are hidden walls, floors and ceilings of your house, to avoid hazards while installing TVs, cabinets, garage shelves and more. Don& 39;t need to pay a electrician, you can do a test with stud finder. Feature - Color: Black - Material: Plastic and metal - Size: 15.5 x 6.9 x 3cm - Compact handheld body and anti-slip design, convenient to use - Can detect metal, STUD, AC wire inside the wall. - When detect metal, wood or AC wire, the detector has sound alarm, and shows analog display - Can detect STUD in the same object - Powered by a 9V battery(Not included), no trouble with dragging wires. The ergonomic grip design provides you comfortable grip feeling. A/C detector can avoid the mistakes of messing up with the live wire. You don& 39;t have to be a professional to use the stud finder. - Warm Tip: Dear buyer, Due to lighting effect,monitor& 39;s brightness,manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. sincerely hope that you can understand Thank you