Feature: 1. SILENT: Eight soft silicone pads at the 4 corners absorb vibrations at high speeds. The maximum noise is only 31.2dBA, which is equivalent to the sound of falling leaves, and will not disturb your work or game. 2. HIGH EFFICIENCY HYDRAULIC BEARINGS: The cooling fan adopts MFDB hydraulic bearings and low friction magnetic levitation bearing technology, which has a longer service life than the traditional bearings, and the bearing life can reach more than 10,000 hours. 3. SMART TEMPERATURE CONTROL: It can dynamically control the fan speed in the range of 500 to 2200rpm to reduce noise and provide a more comfortable using experience. PWM pin can be inserted into the SYS FAN pin. 4. 7 BLADES DESIGN: The fan is designed with 7 blades. When the speed reaches 2200rpm, the airflow can be up to 63.94CFM, providing stable air pressure and strong airflow for the case. 5. EASY INSTALLATION: This cooling fan is compatible with all types of chassis, very easy and quick to install. It is designed with humanized power supply interface, plug and play. Specification: Item Type: PWM PC Case Fan Material: Plastic Color: White Product Size: Approx. 120x120x25mm / 4.72x4.72x0.98in Parallel Hole Distance: 10.5cm / 4.13in Diagonal Hole Distance: 14.8cm / 5.83in Bearing Type: MFDB Rated Voltage: 12V Rated Current: 0.13±0.02A Rated Speed: 2200RPM±10 Airflow: 63.94CFM Function: 4 PIN PWM. Package List: 1 x PWM PC Case Fan4 x Long Screw4 x Short Screw