The Enermax Aelous Aluminum Notebook Cooler is currently the only notebook cooler on the market with the biggest fan. A big giant 250mm fan is attached to the notebook cooler giving you the most airflow for the least amount of noise. It's powered off the USB power source. This big daddy of notebook coolers got it all. It has a high / low fan switch. Think the led lights on the fan is annoying? Well it also come with an on/off switch for the led light.