http://www.sennheiserusa.com/findfrequency/

Sennheiser offers this link to help wireless users determine the validity or legality of their wireless units. I'm not certain it's completely up to date since the auction just recently ended.
I intend to check my wireless units to see if they are either still legal or if I can still squeeze in on my illegal bands without being noticed and hopefully without interference.


Does the noise in your head bother me ?