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 25mm Rated Fan Speed: 600 - 2000 RPM Air Flow: 26.8 CFM / 45.5 m3/h Noise Level: 9.5 dB(A) - 21.0 dB(A), 0.08 Sone - 0.4 Sone Power Consumption: 12 V, 0.12 Amp Weight: 84 g Bearing: Fluid Dynamic Bearing Cable Length: 400 mm Warranty: 6 Years