Wife Bought Loftie - tips for locking it down?

My wife went and bought a Loftie white noise machine. I'm not thrilled that she spent $150 for an internet enabled white noise machine. Is there anything I can do to lock it down so it cannot detect other devices on our network? I don't really want to throw away $150. I am decently technical but I am not a network engineer.

I do know it's in our 2.4 ghz channel and everything else is on our 5 ghz channel.

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