Ergo E. Eazy top is essential to form ergonomic, adjustable workstations. With a high-functioning base (sold separately), the worksurface top adjusts instantly in height from 29" to 39" with a pneumatic lever, allowing use as a sit-down or stand-up workstation. Base includes the keyboard platform, mouse platform, printer shelf and CPU holder. TAA-compliant Ergo E. Eazy is part of the True Adjust family of ergonomic products and has achieved Greenguard Gold Certification. Purchase the Ergo E. Eazy base (BLT82493) for a complete unit.