Tool-Free Install Knob Adjust Keyboard TrayAll-in-one keyboard platform with 5-1/2" height range, 360° swivel and +15°/-15° tilt. Easy height and tilt adjustment; just loosen knob, position tray as desired, then re-tighten knob. Mousing surface can be positioned right or left. Full-width leatherette gel wrist rest with antimicrobial product protection. Precise™ mousing surface extends battery life. Installs without tools in as little as 10 minutes. Color: Black; Workstation Type: Straight.