Ergotron 33-349-211 WorkFit-S Dual with Work Surface and Stand Improve your energy and productivity by standing or sitting as you work, and then switch positions whenever you choose Counterbalanced adjustment points allow instantaneous, tool-free repositioning while you work Promote fitness and comfort as you compute, reducing potential back and neck pain by adding movement into your work routine in a truly ergonomic workstation Easily and simultaneously lift keyboard and LCD screen to proper height for unsurpassed ergonomic comfort Patented Constant Force lift technology provides fluid, one-touch adjustments of the keyboard and monitor positions for personalized computing