The laptop tables are made of high-strength aluminum alloy with 2 non-slip buckle and 6 sturdy adjustable abs auto-locking joints,convenient to use and carry.ventilation holes could provide strong air flow to dissipate the heat from bottom of your notebook for better heat dissipation.each folding leg has 3 knobs which can adjust any height and angle you need.360° revolve provides the high flexibility just as human.adjust height from 1.5 to 19 Inch (4 to 48cm).the adjustable laptop table can be used as a cozy desk for bed or sofa,writing standing desk,dinner tv serving tray,sound equipment,book holder,writing desk and tablet holder etc,meets all your different demands.