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 motherboard Dimensions: 120 x 120 x 38.5mm Rated Fan Speed: 400 - 1500 RPM Air Flow: 56.3 CFM / 94.7 m3/h Noise Level: 10.0 dB(A) - 23.5.0 dB(A), 0.08 Sone - 0.5 Sone Power Consumption: 12 V, 0.13 Amp. Weight: 140 g Bearing: Fluid Dynamic Bearing Cable Length: 300mm