:DeltaDimension: 120x120x38mmFan speed: 4500-10%RPMBearing type: double ball bearingService life: 50,000 hours (25 °, relative humidity of 45~85% environment)Fan noise: 75DBFan air volume: 200.30CFMRated voltage: 12V 3ASpeed monitoring: supportSuper durable metal cavity + dual ball bearings, suitable extreme heat or server use.Buyers took the time to explain what fans want interfaces, fan does not in itself with the interface.The fan as a special fan, very violent, Super air flow, noise,The fan was too violent, I have been a fan leaf cut 2 times. To ensure safety, recommended use with safety nets, this shop on sale in the fence on the left column