Sumu Headphones

I have two purposes for the use of noise cancellation headphones. Sometimes I travel on the aircraft and the noise of the engine block. Other Times, I'm at work and the need to vote for a phone number, so I can concentrate. Most of headphoens I've tried to do pretty good job of blocking the engine noise from planes, but they are not as well stop the vote. Direct Sound heeadphones only noise reduction headphones, which are really a great job blocking both types of noise. As an extra bonus, these headphones are not needed batteries, and get free, beautiful, white noise MP3 with your purchase.