... .Rotational speed:2500~3000rpm Mini Metal USB Fan, mini fan, USB fan, laptop fan, portable fan, cooler fan, desk fanUltra-Low Power & Strong WindFree ... angle adjustment.Move UP & DOWN. 4 inch metal mini portable laptop USB fan ... 5*48cmMeas: 54*39.5*57cm This Computer USB Fan is power by USB cable or 3AA batteries. It ...