Uses SmartFit System Measure, Adjust, Fit. Workspace that works for you. Set up your keyboard area with ergonomics in mind. Match the modular platform system to your SmartFit personal comfort color. You can then use all 3 platforms for a large mousing area or remove one platform if you have a smaller desk. Keyboard and mouse wrist rest is included. Low profile, 11" articulating arm sits under desk and is able to adjust 6" in height, +/-15 tilt and rotates 360. Track is 19". For straight workstations.