Features: -1500rpm high speed, can provide 96.2fm (each fan) large and strong airflow for your devices. Double air volume, bigger wind right for PC computer laptop. -With USB port, plug and play, easy to use. -Both sides of the fan with metal mesh can protect your fan blades, cables and fingers, you can always use these fans safely. -Made of PBT plastic, so the entire fan frame and fan blades are quite strong. In addition, the fan adopts pure copper motor, which is high temperature resistant, energy saving and durable. The lifespan of this cooling fan is up to 35000 hours at 25℃. .