Technically, you don't 'hear' the buzzing, but if you feel the transducers (the larger part that sits on your cheekbones) you can feel the vibrations as sound plays. These vibrations travel through your skull bones to the cochlea, where signals are then sent to your brain and interpreted as sound.Ah, didn't know that. Watching a TV episode I noticed some interference, now I'm wondering if it was that. Oddly, one episode was clear, the next had the buzz; same volume, perhaps the recorded volume of the episode varied.
FYI since it was mentioned above, Zovimax has a magnetic charging connector.
So, the louder the volume, the more/harder the vibrations. Or, the 'buzzing'.