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Since my ultrabook only has two USB ports, I bought a bluetooth mouse to free up one of them.
It worked for a while, and then Windows 8 started disabling the driver due to errors. At this point, the device is pretty well worthless.
I've spent a lot of time trying to keep it working, and I've decided it's just not worth the trouble.
I bought these headphones after trying them out at Narita airport in Tokyo earlier this year. I didn't have time to charge the internal battery before the flight, so I used AA batteries in the included adapter cable. That was the only time that I used the external battery. I've logged about 75,000 air miles using these headphones without a single problem.
The noise reduction is excellent, and the headphones are quite comfortable. The digital technology allows the user to adapt the noise reduction curve to the ambient conditions.
Yesterday I swapped headphones with a friend while riding in the back of a Canadair regional jet between San Francisco and Albuquerque. Those of you who have ridden in that section of this aircraft know that it's one of the noisiest rides around. I found that I could barely hear my iPod with his noise-canceling phones, while listening was easy and enjoyable with the Sony digitals.
Since they're digital, the phones are thicker than other brands. That's not a big problem for me. However, the huge case is a problem and doesn't fit easily in my briefcase, so I've started carrying the headphones in a stuff sack with another sack for the charger and other accessories. Everything now fits fine in my briefcase and carry-on.