... blade,no hurt 5.on/off switch, plug and play USB fan with program flashing word, can show customer's ... word as required1.mini usb fan for PC, laptop, office use2.powered by PC ... USB 5.0V or any USB hub3.Built in on/off switch, 5 led ... noise and heat operation, good for study, work or game.9.USB plug and play, it is not necessary with air- ...