Power-balanced 9-blade design + three-blade chamfers reduce noise while increasing air volume and air pressure by 20%. Silent shock-absorbing foot pads vibration noise caused by fan blade rotation. Propeller performance fan blade design. Series power supply interface design allows multiple fans to be connected in series, and only one motherboard socket is needed for power supply, so there is no need to worry about insufficient motherboard sockets. PWM intelligent temperature control. Speed:800-1500RPM10% Bearing:hydraulic bearing Air volume:48CFM10% Noise:20dBA+10% Voltage:12V DC Current:0.11A10% Power:1.3W Lifespan:50,000 hours Interface:PWM 4-pin temperature control (plug supports series connection) Colour:Black-White Material:ABS Size:120x120x25mm Package Contents: 1 * Cooling fan 4 * Fixing screw Only the above package content, other products are not included. Note: Light reflection 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.