1. Designed with aircraft propeller blades. Large air volume output.2. The 4pin pwm fan can be automatically controlled by the motherboard, and the fan speed can be adjusted in time according to the computer temperature.3. Support automatic speed regulation. Accelerate heat dissipation at high temperatures. Low-temperature deceleration operation. Delay the use of fan bearings.4. 12cm silent fan adopts hydraulic bearing design, high quality, continuous service life up to 50,000 hours.5. Application: Suitable for 120mm chassis fan installation or radiator fan replacement.Product name: cooling fanFan size: 120x120x25mmFan speed: 800-1500 RPMBearing: hydraulic bearingPower interface: 4-pinFan type: 4PIN PWMFan voltage: 12v dcCurrent: 0.23 to 10%Power: 2-4WAir volume: 45 CFM (maximum)Noise: 15-25dba10%Material:ABScolour:black WhitePackage Contents:1 * cooling fanOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.