Features: brand new and high quality High-precision double ball bearing. Large air volume design, stable air flow, low noise and large air volume. Support PWM speed control function, front and rear fans of the miner. Intelligent temperature control and speed regulation. Fan interface board 4 pin interface. With high precision ball bearing 7000rpm. Suitable for a variety of application scenarios,can be installed in CPU radiator, or used on the chassis that require a 12cm fan. Specifications: Model: FGD1212HBL-29 Size: approx 120x120x38mm/4.72x4.72x1.5in Current: 3A Speed: 7000rpm Air Volume: 268.3cfm Wind Speed: 12m/s Noise: 60db-a Bearing: High-precision Double Ball Bearing Package Includes: 1 PC x Cooling Fan note: Do not for touch the blades and the power cord around the fan or pull the power cord, the shaft and power cord will be damaged; Please avoid the entry of dust, water droplets and small insects, which will affect the life span and produce defective products; Do not use in flammable gas and any harmful environment; Please use it within six months, long-term storage will affect the fan performance due to the storage environment; When the fan is in operation, please do not attempt to lock the fan for a long period of for time. This will cause the fan to be continuously stopped and generate high heat and burn the fan; The screw torque of the lock for shell shall not exceed 4Kgf; please do not use a screwdriver, iron rod, etc. to block the fan, as this will damage the fan;