Ah, thanks for the clarification. I still don't know the model number of my Sonys (they're not with me at the moment) but they *are* a noise-cancelling model. They have a spot for an AA battery and an on/off switch. The most dramatic demonstration of the technology was when I was wearing them in a room with some background noise, like fans and general walla. I put them on, no music, and could hear the crap. I switched them on, crap gone, just gone. This was repeated, reversed, it sounded like a magic trick. The effect was dramatic. Coupled with the music, used as intended, they're excellent. I love them.
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