Fellowes® Designer Suites™ Premium Keyboard Tray with Comfort-Lift™ system lets you slide mouse platform left or right over keyboard numeric pad and offers 2 custom height positions. Mouse platform tilts forward or backward, adjusts up or down to height of keyboard, and mounts on left or right side of keyboard. Warning Trak™ helps prevent mouse from sliding off platform. Loosen single knob to adjust tray height and tilt, then retighten knob to lock in position. Soothing memory foam wrist supports with Microban® antimicrobial protection to help keep product cleaner and place hands/wrists in neutral position. Non-skid pads prevent undesired keyboard movement.