The stud finder hangs on the wall hands free for visual reference when hanging shelves, cabinets, paintings, mirrors, hooks, televisions and other heavy objects.Finds wood and metal studs behind drywall by locating nails and screws in the studsNo batteries required. Hangs on the wall hands free when studs are located shelves, cabinets, paintings, mirrors, hooks televisions and more.color:BlueMaterial:Plasticsize:7 x 3.3 x 0.6cmPackage Contents:1 x Stud FinderOnly 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.