[caw]

Because there's a niche market for people like myself that wear noise canceling headphones without music?

Seriously though, if I go in a server room I'm putting noise canceling on. I still need to hear if someone is talking to me, so no music unless I'm doing repetitive work.

[mikeg8]

Fair enough. I think you are a very small niche though and my proposal would save tens, if not hundreds of thousands of people from wasting expensive batteries. Worth it.