... 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 ... air-condition for cool environment anymore, just with DC 5V fan, energy saving.10.Working Volt: DC 5V, Working current ... guarantee a wonderful product.12.Product size:36cm program usb led fan(KL-8219)