WORK HOW YOU WANT TO. Versatile and agile, Safco's VUM Height-Adjustable Mobile Workstation helps get you up on your feet and tackling your daily tasks just about anywhere in your office, home or classroom at an elevation that's ideal for you. MOVING ON UP OR DOWN. Press the handle below the VUM's top surface and push down or pull up to select a height anywhere along its 12.25" vertical adjustment range pneumatic operation assists with raising and helps keep the worktop in place once set CONVENIENT STORAGE. Put your stapler, tape, cell phone or other small items on the fixed lower shelf and hang your computer bag or purse on the integrated hook - the lower shelf does not move with the worktop and always remains at the same height. ON THE GO. Four pivoting wheels give you the freedom to roll to more inspiring spots in and around your work area whenever needed lock the two front wheels to keep the VUM in place while you type, write, research, review or collaborate. DIMENSIONS. Overall: 30.75"W x 22.875"D x 36" - 48.25"H. Top Platform: 21.5"W x 16"D. Lower Shelf: 14"W x 9.75"D. Fixed Lower Shelf Height: 29.5". Assembly Required.