Humanscale® Comfort-Lift™ system lets you slide mouse platform left or right over keyboard numeric pad and offers 2 custom height positions. Height and tilt indicators let you customize keyboard tray settings. Mouse platform tilts forward or backward and adjusts up or down to height of keyboard.  Mouse platform mounts on left or right side of keyboard.  Warning Trak™ helps prevent mouse from sliding off mousing platform.  Lift and lock feature lets you adjust height with one hand.  Health-V™ memory foam supports with Microban® antimicrobial protection. 28-3/16"W x 21-1/4"D x 5-3/4"H. Black.