If it emits radiation on the radio spectrum which falls in to the radio spectrum managements job, the units would at least have to be cleared with them that it does not create any unwatned spruious emissions or hash. Same process the guys in the states would have to go through with their commercial units. Just because the end user can use it without (if cleared by the FCC). There's a reason for licensing transmitters for manufacture (not talking about the actual use now) to make sure it's up to standards and safe, and won't cause other devices problems.

How do u explain electro-static speakers then? Or like those fancy Japan speakers they put in cars now that allows each passenger to hear their own audio without effecting other passengers in the car? You can't make pressure waves that perfect, I would assume this is electro-static speakers.