Nasty earbuds, awful sound quality (no bass, and abrasive treble), and the "noise cancellation" is a joke. Enabling the noise cancelation just appears to throw white noise at you - it was "quieter" with the feature turned off.
Worst headphones I've ever bought; don't make the same mistake as me.

I picked up a pair of these for my daughter. She complained of a buzing sound. I tried them out and noticed the following. No or very little low frequency response (Base). With the volume up there is a hissing in the background. Since the frequency response of these earbuds is mostly high end, that hiss could quickly get annoying. By lowering the volume on the inline volume control and turning up the volume on the device it was plugged into, I was able to reduce the background hiss.

I have another set Plane quiet noise canceling headphones which are substantially better than the Coby earbuds. However the Plane Quiet headphones sell for about $70.00 so there is a significant difference in the price.
These are OK but I think you might consider spending a little more money getting something better. If, on the otherhand, you are looking for a cheap pair of disposable noise canceling earbuds and have low expectations then you might consider the Coby eabuds.

The plastic tips for the ear buds come off ridiculously easy - I haven't lost one yet but I've come close so many times I know its just a matter of time. The noise cancellation is OK at best but it adds a static sound that is almost as irritating as the engine noises your trying to cancel out.

I just bought this - not through Amazon.
Boy are they junk! All other 1 stars are correct.
Now days you can often get a cheep something that works - these are an exception!
More specifically . . .
The remote is huge and made from creepy cheep plastic.
The cord is thick, junkie, and too short.
The noise cancelling is imperceptible. It seems to just make the sound louder. However there is a microphone built in.
The sound is truly terrible.
Beyond that the airplane adaptor seems nice.
I was fortunate in that one side had almost no sound output.
This way, I can take them back!

These by far are the worst earphones I've ever purchased. They don't stay in your ears, require constant adjusting and the quality stinks! Save your money and purchase something different.