Articulating Keyboard/Mouse Arm makes it possible to use your keyboard and mouse while seated or standing. The low-profile mechanism provides clearance for your knees. To adjust, simply lift and release the tray to adjust for 10-1/2" height range (5-1/2" above desk). The 28" wide x 11-3/4" deep keyboard platform includes a Therasoft wrist rest and provides space for right or left mousing. Keyboard tray has a 30-degree tilt range (15 degrees positive and 15 degrees negative reverse angle) and full 360-degree rotation on a smooth operating 21" track with precision glides. Clear lift-up Lexan mouse surface displays pictures, memos and more to personalize work space. Keyboard platform can be stowed under the desk when not in use and meets BIFMA standards.