xgear Ergonomic Adjustable Portable Folding Laptop Bedside Table Stand Desk Bed Sofa Bed Mate Tray With Fan Laptop table with adjustable height ultra-quiet fan for active cooling Helps tremendously to keep laptops cool in the heat power supply via usb, cable length: approx 40 cm Variable height: 23.2, 24.6, 27.1, 30.6, 32.1 and 32 cm folded only 5.5 cm high Surface tilt: 20 , 10 , 0 , -10 , -20  dimensions of work surface: 52 x 31 cm