... use OEM DC 5v quiet usb fan with metal guard and stand 1.Size: 149.73* ... portable,use it anywhere there's usb device(Like notebook,PC)Model Size/color Spec Description ... anywhere there's usb device(Like notebook,PC)Low noise,super quiet Metal guard to prevent finger ... widely applicable to machine equipment cooling, heat dissipation, like PC cooling, Car refrigerators, air-conditions, kitchen exhaust ...