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It's a Rii Mini Keyboard i4, and my concern is that it's a microphone. I just noticed the hole and think I'm probably wrong in what it is considering how big a deal it would be if it was a mic that isn't advertised.
What could this hole be for or what is it? Thanks in advance, hope this doesn't violate any rules.
I also have this exact same device and I also noticed annoying mouse jitter. I tentatively diagnosed it as the dongle itself getting overheated (that PC gets pretty hot and putting on a fan on it seemed to help). I definitely want to try your suggestion now