What I like about the Samson is the clip-on mic has the transmitter built in so I don't have to run a cord to the transmitter in my pocket or belt pack. Are there other models that do this? It's not clear from reading info on store sites. Also, it needs to be in legal bandwidth. I'm very confused about that. Is there a good place to read up on the issue and find out if a specific wireless system is legal in the US? Any help, links, or pointers are appreciated.