1)usb fan is portable,convenient 2)for PC or notebook with USB connector,no need extra power,easy 3)EVA fan blades,safe to use The charaters and advantages of our usb fan: can be computer usb interface powered ,also can powered by battery;battery and usb dual; with switch,more convenient to control; low noise; soft EVA blades,keep user free from injuries,very safe;flexible pvc fan neck, can ...