“I have to agree with other reviewers that it sounds like a demented mosquito… That aside it seems to do the job but really needs a hole cutting in the lid of the case for better airflow”
“Fits in the case easily keeping the Pi4 cool and can be adjusted between 60c to 80c to turn on and I would recommend it for the Official Raspberry Pi 4 case.”
“Excellent little machine. Very easy to put together. Ended up buying a fan later which has a slightly annoying sound but as it is stuck in a cupboard it is no problem. Great service from Pi Hut”