Reversed blade that can act as an intake fan with the front view Performance & Silent Balance: Design combines performance and quiet, ideal both as a case fan and for CPU coolers, water-cooling radiator, 91.15CFM, 2.63 mm H2O, 4-pin PWM, max. 34 dB(A) Squama particle Patent: Squama particle on the frame, reducing turbulent flow noise increase airflow and pressure efficiency PWM: 4-pin PWM controlled fan speed from 800 to 2400 rpm, with excellent balance of performance and quietness. ARGB Dual Light Loop: The dual light ring equips Addressable RGB LEDs can synchronize lighting with motherboard, lighting effects are individually customizable.