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