Deluxe adjustable desk riser offers a healthy addition to any desk that allows you to sit or stand while you work. The large worksurface accommodates two monitors or a monitor and a laptop. Ergonomic keyboard tray moves up and down with the desk and moves out/in for the most comfortable position. Five height adjustments allow a comfortable standing position. Height adjustments can be set at 6-7/10″, 10″, 13″, 15-2/5″ and 16-1/2″. Easily raise or lower the riser with the adjustable paddles in the front for user-friendly operation. Gas spring will allow you to easily move the desk up and down, even with your computer equipment. Riser is fully assembled for use right out of the box. Attention California Residents: Prop 65 Warning WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov. COLOR: White UPC: 035255999021 UPC: 035255999021. No returns.