Premium quiet fan, 140x140x25mm, 12V, 4-pin PWM, max. 1500 RPM, max. 24.6 dB(A), >150,000 h MTTF Award-winning NF-A14 design has received more than 100 recommendations from international hardware websites and magazines Square frame with excellent airflow and pressure performance: ideal for use on water cooling radiators or as a case fan 4-pin PWM version for automatic speed control via 4-pin PWM fan headers, 1500rpm maximum speed chromax.black.swap edition with attractive all-black design and swappable red, black, white, blue, yellow and green anti-vibration pads for colour-customising