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: 80 x 80 x 38.5mm Rated Fan Speed: 600 - 2000 RPM Air Flow: 28.0 CFM / 47.6 m3/h Noise Level: 9.0 dB(A) - 20.0 dB(A), 0.07 Sone - 0.3 Sone Power Consumption: 12 V, 0.12 Amp. Weight: 82 g Bearing: Fluid Dynamic Bearing Cable Length: 300mm Warranty: 6 Years