Just Mobile Xtand Pro XL is a stylish, sturdy notebook computer stand that is made of solid aluminum, matching the metal finish of the MacBook. Designed to accommodate MacBook 15"/17".The Xtand Pro XL provides two user-adjustable heights for ergonomic comfort. The high-level raises the notebook to the same level as your eye to reduce body fatigue and muscle pains. In this position, it is best when used with external keyboard and mouse. The low-level raises the notebook computer just high enough for you to continue to use the notebook keyboard and trackpad.With Xtand Pro XL, air circulates freely underneath your computer, allowing it to run cooler and quieter. Non-slip rubber pads on the stand keeps your notebook securely in place.