Super Silent fan PWM function 2 Ball Bearings Fan Guard Speed Control Bracket 70mm Fan Advanced Features: Fan Dimension: 70x70x15 mm (L x W x H) Bearing: 2 ball bearing Rated Voltage: 12VDC Rated power: 3.0W Rated current: 0.25A Fan speed: 3,700 RPM +/-10% Air flow: 28.0 CFM Noise level: 29.7 dBA Connector: 4-pin power supply 3-pin motherboard