1. Use upgraded internal sensors. It senses changes in the density of the space behind the wall and can locate the stud center very accurately. 2. Powerful to quickly and easily locate wood metal studs, joists, metal pipe rebar and live AC wires behind walls, floors and ceilings. 3. The design of the alarm allows you to know the situation of the wall at all times, making the operation more accurate. 4. The wall detector can clearly identify what objects are inside the wall, which is more intuitive and accurate. Wood detection, metal detection, electric current detection. 5. Wide range of adaptations. This Stud Detector Quickly Locates Wood, Metal, And AC Wires Hidden In The Walls, Floors, And Ceilings Of . Helping You Avoid Danger. Battery type:9V battery,Notes:shipped without battery! Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:Pink Material:ABS Package Contents: 1 * Wall Detector 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.