Multi-function wall sensor: Different from most wall scanner functions (AC, metal, stud, depth scan) on the market, this wall detector adds nail finding, nail collecting and bubble level. More accurate and more sensitive: The stud detector has a smart sensor chip, which can accurately and quickly locate studs, metal, brackets, pipes and live AC wires behind walls, floors and ceilings; with deep/medium/precise intensity sensing levels, suitable for various working conditions and detection of object thickness. Back Nylon Sticker design to prevent product wear and make movement more stable. Colour:Red Material:ABS Package Contents: 1 * Wall detector (1 x 9v battery is not included in the shipment) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.