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 fanSpecifications ... 3*146.5mm,weight: 144g ,easy to carry. 8.Fan occupies small room, stable structure, easy to place.9. ... , cool and refreshing, comfortable. personal mini USB air cooling fan