PST: PWM amplifier integrated on motor circuit, 4 pin plug for receiving power and PWM signal from motherboard, 4 pin socket for CPU cooler or second fan, 3 pin plug to send fan RPM signal to motherboardDimensions: 120 x 120 x 38.5mmRated Fan Speed: 400 - 1500 RPMAir Flow: 56.3 CFM / 94.7 m3/hNoise Level: 10.0 dB(A) - 23.5.0 dB(A), 0.08 Sone - 0.5 SonePower Consumption: 12 V, 0.13 Amp.Weight: 140 gBearing: Fluid Dynamic BearingCable Length: 300mm