@bruce you’re right rotating the daughterboard would allow for better cooling, but it would put the microphones on the side of the device. We could make separate smaller PCBs just for the mics (the mics need to be on top or front) and connect them back to the daughterboard. However, one of the other goals for the SJ201 was to reduce complexity as much as possible. That meant doing everything we could to get it down to just one board. We will start with a simple laser-cut enclosure for basic engineering tests. We can also test your suggested orientation to see how it performs with heat. Thanks for the suggestion.