... .Iron processing. 3.Classical painting process. 4.Lower power. Specifications4"USB computer fan 1.Unique DC brushless motor. 2.Iron processing ... : 5V DC6. Packing:14.5*9.5*15.5cmThe 4"USB fan with unique DC brushless motor, single-cycle ball, iron ... processing, and classical painting process. Lower power than the traditional USB fan, don't worry the computer mainboard. Ultra silent pedestal ...