Tarkan USB Powered Portable Laptop Cooler with Adjustable Speed Vacuum Fan [Hot Air Extraction] Laptop overheating, affecting their life, high temperature and even lead to the motherboard / CPU burn. Cooling of the laptop are very important, we are not only cool, but also to the CPU to provide a good working environment and prolong life. Operation Instructions: Begin to use, in order to fast cooling, open to the largest (3000 RPM), temperature drop down, About 15 minutes, transferred to the minimum (1500 RPM) remains constant, so that we can keep in a reasonable working temperature, and can prolong the service life and lower noise.