Features:1) CPU type: Intel P4 socket 775 3.8GHz 2) All Intel Celeron D 3) Rate voltage: 12V DC4) Rated speed: 4,200±10% rpm 5) Air flow: 55.94CFM6) Noise: 26.4±3dB(A)7) Bearing type: one ball one sleeve 8) Life: 45,000 hours producing area:China