Let the hive mind of Engadget get that for you.
"I am looking for a device that will stream sound from one source to several recipients. For example, I want to stream sound from my TV or stereo to my phone or MP3 player that has radio and Bluetooth capabilities. I have looked into radio transmitters and they seem like a decent choice, but I can't find one that uses external power (USB or from the plug) and I would want one with a transmit range of around 50 meters. Thanks!"
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Much to my surprise, Cox cable installed a M-Stream card into my TiVo without me requesting it. Of course, they installed in into slot 2 and couldn't figure why it didn't work but that's another story...