ONE OF MY "SUPER DUPER" RADIOS WAS RUNNING WARM AND FRANKLY, I HATE NOISY FANS AND TRUTHFULLY ALMOST ALL FANS. I FOUND THIS AND DECIDED TO GIVE A WHIRL AND TO MY SURPRISE YOU COULDN'T EVEN HEAR IT RUN. IT PLUGS INTO ANY USB PORT (USB A) AND I PUT IT UNDER THE RADIO AND WOW! WHAT A DIFFERENCE. COOLER RUNNING AND I EVEN NOTICED IMPROVEMENT IN THE MODULATION AND CARRIER NOW THAT THE TEMPERATURE WENT DOWN.