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I've always assumed the dongle uses bluetooth as well. Why invent a new protocol when there's one that does exactly what you want?
Dongles are usually 2.4ghz radios, supposed to be lower latency and more stable than Bluetooth.
Edit- in reality though, bluetooth has come a long way and generally more convenient, users likely wouldn't notice a difference in day to day work. Personally I still wouldn't recommend gaming on a bluetooth connection when latency and micro stutters matter.
That’s the same frequency as one of the main Wi-Fi bands, ~~I would imagine they’re probably just reusing that technology for this communication~~
It's also the frequency of Bluetooth and your microwave because it's unregulated. Dongles aren't Wi-Fi or anything like it.