Adjusts for use while standing or sitting. Install monitor/keyboard shelf above printer shelf for a stand-up workstation, below for a sit-down workstation. Shelves adjust in 2" increments. Fixed bottom shelf for supplies. Retractable keyboard holder has pullout mouse board for right- or left-hand use. Includes cable management tray that assembles to either shelf. Shpg. wt. 79 lbs.