Premium quiet fan, 60x60x15 mm, 12V, 4-pin PWM, max. 3500 RPM, max. 19.8 dB(A), >150,000 h MTTF Award-winning 60x15mm A-series fan with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance Ideal replacement for noisy or broken 12V 6cm fans in DVRs, NAS, network and storage devices, 3D printers, etc. 4-pin PWM version for automatic speed control via 4-pin PWM fan headers, 3500rpm maximum speed (3050rpm with supplied Low-Noise Adaptor) Includes anti-vibration mounts, fan screws, Low-Noise Adaptor, extension cable and y-cable for running two PWM fans on the same header