WPS4 Presentation Stations: This mobile computer cart boasts 4 convenient worksurfaces. The larger shelves will hold most document cameras. The Adjustable second shelf raises flush with the top shelf or lowers up to 24" beneath the top shelf to create your perfect working height on this multifunction AV cart. This attractive multimedia cart has sturdy, black steel sides withlaminate shelves. This mobile cart has four 3" furniture casters (2 locking). •Four laminate work surfaces. •Second shelf adjusts in 2” increments flush with top shelf or lowered 24”. •3-Outlet UL approved electrical assembly with 15 ft. cord, and cord management wrap. •3” stem casters ensure mobility. Two casters are lockable.