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Wireless input devices usually talk in the 2.4GHz and 5GHz bands of wifi. They are allowed to, since the spectrum is basically open for anything (AFAIK) but they effectively jam wifi when in use. So this is intentional while the USB3.0 cables jamming wifi seems unintentional.

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Wireless mice usually don't talk very much. Mine runs for about a year on a single battery (the spec says up to 18 months). That's MUCH too little power to be able to effectively jam anyone's wifi.

Reduce its capacity by a small fraction while the mouse is moving, yes, effectively jam, no way. That would need much more power than a wireless mouse has.

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