2-Pack 40mm USB Fan 5V with Multi Speed Controller includes the anti-vibration pads to reduce the vibration noise. This 40mm dual fan is suitable for cooling the Gear VR, Aquarium, Roku, Router, Raspberry Pi, Helmet, cabinets; it is also suitable for variety of other applications from Air Circulation for plants to robotic projects. It includes multi-speed controller for optimum air flow and noise control. With multi-speed controller this fan can reach the noise level as low as 15.9dBA at 4.56CFM Airflow 4.56CFM. At the maximum speed the airflow is 7.32CFM with noise level of 22.6dBA.