Ergotron WorkFit-S Single HD Workstation with Worksurface+ (33-351-200) Promotes proper ergonomic positioning and inspires an on demand sit-stand work routine. Easily and simultaneously lifts keyboard and LCD screens to proper height. Ergonomic back-tilt keyboard tray.WorkFit-S Sit-Stand Workstation for Mid-Size Monitor, HD, with Worksurface and Large Keyboard Tray Counterbalanced adjustment points allow instantaneous, tool-free re-positioning while you work. Burn more calories by choosing to stand for periods of your work-day. Maximum LCD height adjustment of 23-Inch (58 cm) for premium comfort For displays 16-28 lbs. (7.3-12.7 kg)