1STPLAYER FIRE ROSE Hydraulic bearing, Anti-knocking Cover, Smart Speed Control, 12cm Silent PC Cooling Case Fan The pressurized blades 12CM fan adopted on FIRE ROSE can offer high as 68.4 thrilling CFM to our enthusiastic gamers The Anti-knocking cover realizes 20.46 dBA silent application for CPU air cooling The 3/4 pin connectors offer high as 1200RPM speed for ideal cooling effects The powerful hydraulic bearing provides life expectancy long as 40000 Hours 50CM length cord