The Z-Lift Notebook Desk Stand is the only product that lifts and inclines a notebook into dozens if not hundreds of positions.without the use of a support arm. It can raise the notebook up to a maximum height of 9.5? without tightening any knobs or adjusting any fixtures. The unit supports the weight of the heaviest notebook up to 17 Lbs. by suspending it in mid air in virtually any incline or elevation up to 9.5? The Z-Lift supporting mechanism works through tension locking clamps located in each of the four hinging joints. These locking clamps have been tested up to 5,000 operations. This means if the unit is expanded and contracted every day it would have a life expectancy of 13.69 years. Or put another way, it will outlast your next two notebooks provided you replace them every five years. The Z-Lift has a fold-out support shelf that supports the notebook and prevents it from sliding off the platform regardless of the angel. The support arm has variable height adjustments depending on the notebook's thickness. It has a starting height of 7/8? and can expand up to 1-1/4? The Z-Lift has a built-in cooling fan with a unique fan exhaust design that swirls air 360? under the notebook. The fan is set into a recess channel that creates an air space for the air to circulate and forces out the hot air that is radiating from the bottom of the notebook. The Z-Lift has a built-in 4-port USB hub and a hard-wired USB cable for easy connection to the notebook. This sleek and stylish product has a smooth shiny finish of gray and black.