Crazy Genie Mini LCD Vacuum M18 Portable USB Cooler Air Extracting Cooling Fan Turbo Radiator Low Noise Desgin for Laptop Notebook Fan speed: 4500 +- 10% PRM M18 portable USB air cooler turbo radiator cooling fan for notebook laptop Turbo radiator, through turbine wind pressure, suck the hot air inside notebook strongly, heat dissipation directly, the effect is very obvious After electrify, even if you don't start up laptop,it can real-time detect the notebook and the surrounding environment temperature Multifunctional design: Intelligent temperature control acceleration (Speed range: Intelligent 2000 to 4500 +-10%, constant speed rotation speed 4500 +-10%)