The Fellowes 8017901 Designer Suites Premium Keyboard Tray features adjustable height and tilt on keyboard tray plus versatile Comfort-Lift system for mouse platform adjustment. Mouse platform tilts forward or backward, adjusts up or down and mounts on left or right side. The Warning Trak keeps mouse from sliding off platform. The single knob adjusts tray height and tilt. It includes soothing memory foam wrist supports with Microban antimicrobial protection.