Ergotron 33-351-200 converts your working desk into an ergonomic workstation that lets you work sitting or standing. A large keyboard tray and extra worksurface to hold the phone, tablet and other writing material make the workstation self-sufficient. Convert any surface into an adjustable-height standing desk with the attachment of the Work Fit-S. Make computing comfortable for prolonged periods - stand up whenever you want. This sit-stand workstation is extraordinarily simple to use. With the push or pull of a hand, you can instantly raise or lower your keyboard and display in one easy motion, yet all the while the system will remain stable throughout your work routine.