Why Does a PS4 Pro Make a Sound?

We looked it up, found someone who had noticed something about that exact same router and then just... And then to learn that the router has no physical way of making a sound? To me, my thoughts would immediately go to a frequency being created electronically that would cause something else to vibrate. Sound is just energy vibrating the air and objects. I want to know which PlayStation we're talking about. Was it a PS4? Was it an old PS2? Was it ... Well, was it a PS5? Because I have personal experience with a PS4 Pro sounding like an airplane is taking off in my living room when I'm playing with it? Probably, no, those are