1.[Powerful Fan 120mm] Standard 120mm computer fan, running at 900rpm to 3000rpm, produces constant and continuous airflow to keep everything cool and reduce temperature, if more airflow is needed, the included dial controller allows you to increase the airflow 2.[Controllable Speed] Allows you to vary the voltage/speed of the fan. You can adjust the speed of the fan to optimize the airflow and noise for your application 3.[Fan IP67] It is designed to withstand the harshest outdoor environments where moisture/dust exists; keep your equipment running smoothly without worrying about rain, splashing water, dusty environments or brief immersion 4.[Plug and Play] The speed controller has a standard two-prong wall plug to power the power supply. Enables the fan to be powered by an AC outlet; simply plug it into the outlet and start the fan Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store