Attaches to virtually any work surface without tools or complex instructions.Patented clamp easily attaches unit to desktop (5/8 1-1/2 thick) without surface damage (33-3/4" wide space required).Tray adjusts to three height positions below desktop: 2-3/16, 2-13/16, and 3-1/2.Tilts -3, -6 or -9 degrees.Soothing memory foam wrist rest with Microban antimicrobial product protection helps keep product cleaner and places hands/wrists in neutral position.