The 120mm Blue LED fan with VR has an adjustable speed, you can adjust the speed from silent mode (800rpm at 14.00dBA) to high-performance mode (1600rpm at 31.84dBA), it is an all-in-one case fan to meet all user's needs! The blue LED is stable which means the level of illumination remains the same regardless of the fans speed! This 120mm fan has a noise level of 14~31.84dBA at 800RPM~1600RPM with an air flow of 33.11CFM~66.21CFM. The fan is 120mm x 120mm x 25mm with a 3-pin and 4-pin connector. This fan has an MTBF of 30,000hours and weighs 110g.