Premium quiet fan, 120x120x25mm, 5V, 4-pin PWM, 1900 RPM, max. 21.4 dB (A), >150, 000 h MTTF ^^ Next-generation 120x25mm A-series design provides unprecedented quiet cooling performance, ideal for CPU coolers and watercooling radiators ^^ 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