Wireless head audio?

[Monkey_feces]

I know that wireless headphones exist. Is the input adapter bulky? Can it fit a psp? How's the quality?

Is there such a thing as wireless IEMs? I would very much like to plug in a wireless earpiece connected to my psp, so I can pass it off as a hearing aid while class in session.

Where can I pick one of these up?
http://www.scaryideas.com/print/2637/

 

[Mister X]

http://www.etymotic.com/ephp/er88.aspx

Don't think you are going to be passing them off as a hearing aid though.