Premium quiet slim fan, 120x120x15mm, 12V, 4-pin PWM, max. 1850 RPM, max. 23.9 dB(A), >150,000 h MTTF Award-winning 120x15mm A-series fan with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance 120x15mm slim design ideal for low-profile CPU coolers, HTPCs, ITX builds, space-restricted applications etc. 4-pin PWM version for automatic speed control via 4-pin PWM fan headers, broad 450-1850rpm speed range, stops at 0% PWM for semi-passive systems chromax.black.swap edition with all-black design and self-adhesive red, black, white, blue, yellow and green anti-vibration pads for colour-customising (8 pads of each colour)