WPS4 Presenation 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 with laminate shelves. This mobile cart has four 4" heavy duty casters (2 locking). •Four laminate work surfaces. •Second shelf adjusts in 2” increments flush with top shelf or lowered 24”. •7-Outlet UL approved electrical assembly with 25 ft. cord, and two cord wraps. Also has a built in surge protector with indicator light. •4" heavy duty black on black stem casters ensure mobility. Two casters are lockable.