1.Ultra-quiet,5V/12W for laptop 2.Safety metal line grill 3.4 inch mini metal USB fan 4.Rotational speed:2500~3000rpm Mini Metal ... USB Fan, mini fan, USB fan, laptop fan, ... room, smart shape, cool and soft wind. Specification:4 inch Min USB Fan6inch Min USB Fan4pcs of blades3pcs of bladesSize: 15*9.5*16cmSize ...