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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~~
KB/mouse dongles use their own, often proprietary, protocols but on the same 2.4 GHz band. It's like how WiFi and Bluetooth both operate on 2.4 GHz but use different framing and protocols.
Interesting, I did not know how widely used the 2.4GHz band is, thanks for correcting me!
It's also the frequency of Bluetooth and your microwave because it's unregulated. Dongles aren't Wi-Fi or anything like it.