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Speed ControllerThe fan includes an in-line multi-speed controller with power switch to set the fan’s speed to optimal noise and airflow levels for various environments.
Connecting Additional UnitsFor electronics and components that requires more airflow, each fan unit can daisy chain additional MULTIFAN S series fans. Up to four fans can share the same USB power source. MULTIFAN S1, S2, S3 and S4 contains one fan, and MULTIFAN S5 and S7 contains two fans.
Applications This ultra-quiet cooling fan is popular in a variety of electronics and components such as receivers, DVRs, video game consoles, modems, computers, amplifiers, and other audio video equipment.
Pros: Low setting is near-silent, unnoticeable unless it's next to your head and you're a Ferengi. Does the job of cooling the enormous wifi router I got. USB power off the router itself was easy, and the rubber feet meant installation was "gee I guess I'll just lay it on top" and done.
Cons: Did not grant 3 wishes. Does not fly under own power. Somehow my life is still devoid of meaning.
Overall Review: Simple, works, quiet, and the constant airflow does quite a bit to mitigate temperatures for devices.