17 inch laptop cooler max fans 2 fan dimensions 40 x 40 mm properties tiltable special feature anti slip surface max fan revolution 5 000 rpm max noise emission 253 db min noise emission 253 weight 056 kg material acrylonitrile butadiene styrene colour black series hama compact power supply usb nominal voltage 5 v nominal current 025 a width 30 cm height 25 cm depth 325 cm