these are one of many on ear noise canceling headphones ive listened to and they are one of the best ive heard. great amazing clear sound and very handy and accessible, light weight and great quality. great purchase!

High quality sound and make

one battery required

----Update 06/24/09----------Still going strong. These suckers have survived MANY cross-countr

Sound; NC; convenience; price; accessories; and light weight

Don't fold completely flat; rely heavily on NC function; a little overboosted

I like to watch Netflix while on the treadmill but was having trouble hearing. These headphones are just what I was looking for!

These headphones do the job and exceed my expectations. Insane bass that you can hear that subwoofers can't produce. My friend would be talking and pointing gestures at me and I would not know what the language is. Probably the best headphones and doesn't even weigh a pound it feels like.

These headphones are great and as far as I can tell are equal to the "high price brand". Great sound and comfortable to wear. The "high price brand" also cost about 5 times more than these.

Comfortable; Compact; Good Bass; Lightweight; Rich Sound

Better than any that I have used, but I guess it will be better used only for flight journey, which is what was intended for anyway. The wire seems too long for the daily use and for movement flexibility, it is kind of too long. it does cancel out noise and does what it says.

I purchased the Sony MDR-NC40 headphones almost on impulse because the price was really unbeatable, plus I knew I had a trip coming up to test these out on. These ultra-light noise-cancelling headphones retail for $100, and claim to reduce up to 90% of noise.