I'll take this opportunity to share my experience with the "Logitech Wireless Headphones for MP3" as they are so creatively called. I got this set for Christmas and I really liked them. I think the advertised range is nearly correct for line-of-sight, and I could still get about 20 feet through some walls.

The problem is that they did not do a great job on the physical design. I have a much larger head than average (I think I'm about a size 8 hat, maybe a little larger), but I've heard several complaints like mine: the headphones are too tight, and after a while they crack in the middle of the headband.

It's gotten so bad that at this point I think the headphones don't even turn on. They're just broken. So now I have to go through the RMA process which I know is just going to result in another set that will do the same thing.

However, if you have a smaller head, I highly recommend these headphones. They work perfectly, and you can control the volume on the headphones themselves.