air cooling fan 1.size:4inch 2.material:ABS&PP 3.fan parameters:5v,2.1W,2300RPM 5.Features:super quiet, 25000h working ... life personal mini USB air cooling fan Specifications:MaterialABS&PPCertificatesCE,FCC,ROHS ... speed,96mm blade diameter, new DC brushless motor, strong wind, super quiet.2.5V USB(cable length:1.2m) power supply ...