Premium quiet fan, 92x92x25 mm, 5V, 4-pin PWM, max. 2000 RPM, max. 22.8 dB (A), >150, 000 h MTTF ^^ Award-winning 92x25mm A-series design with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior quiet cooling performance ^^ 5V 4-pin PWM version with polarity protection for 5V applications with PWM speed control ^^ USB power adaptor cable allows the fan to run on devices with USB host ports, power banks or USB power supplies such as those used by smartphones ^^ Includes anti-vibration mounts, fan screws, extension cable and OmniJoin adaptor set for connection to proprietary fan headers