Premium quiet fan, 60x60x25 mm, 5V, 4-pin PWM, max. 3000 RPM, max. 19.3 dB (A), >150, 000 h MTTF ^^ Award-winning 60x25mm A-series fan with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance ^^ 5V 4-pin PWM version (3000rpm maximum speed) with polarity protection for 5V applications with PWM speed control ^^ Ideal replacement for noisy or broken 5V 6cm fans in 3D printers, DVRs, NAS, switches, routers, other network and storage devices, etc. ^^ Includes anti-vibration mounts, fan screws, extension cable, y-cable and OmniJoin adaptor set for connection to proprietary fan headers