Review on 🌈 upHere Long Life 120mm PWM 4-Pin High Airflow Quiet Edition Rainbow LED Case Fan for PC Cases, CPU Coolers, and Radiators - 3-Pack, PF120CF4-3 by Dan West

These work. The functionality of PWM and wheelbarrow is good. They are quiet at low speeds. The only thing I don't like is that the brightness of the light changes a lot during the color cycle; Red is much darker than blue. If the colors were changing more slowly, that wouldn't be a problem, but since they're changing quickly, the fluctuations in intensity are annoying.