17 inch laptop cooler max fans 1 fan dimensions 220 x 220 mm properties adjustable height special feature anti slip surface max fan revolution 600 rpm max noise emission 18 db min noise emission 18 dimensions 300 x 290 x 4 mm weight 055 kg material polypropylene series hama maxi power supply usb nominal voltage 5 v nominal current 031 a width 29 cm height 4 cm depth 30 cm