Rated 
Sennheiser Closed Active Noise Cancellation Headphones PXC300 Good buy
Design, Compact and portable - the design allows it to fold and collapse to be compact enough to fit in a small carry case (included) Sound quality - cancels out the humming noise of machines
Price - always have to write about this (paid $138 for item) Headphone lines - gets tangle up easily
Posted Mar 18, 2006 - For those who never used noise cancellation headphones, please do not expect any product to totally cancel out sound. If you expect this, then you will be disappointed. There will be a slight humming sound when you use it but it is not 'noise'. You can still hear conversation quite clearly. For example, you do not need to shout in the gym or in the airplane due to background noise. It cancels the background noise out but keeps the sounds in because they are of different frequencies. I bought this because I read when I use the cardio machines in the gym and it can be quite loud with all the machines going. I also used it on a 16 hour plane ride from New York City to Taiwan. I was able to sleep in it. The headphones cup your ears hard enough not to slip off but gentle enough so you won't get a headache. I was able to hear the stewardess when she came around asking for meal or drink selection. The battery life is rather long. You will hear some hiccups when the battery is running low but you can still use it even when this happens. I have not replaced my batteries yet and I've used it for over 50 hours. (I should soon...) The only complaint is that the lines get easily tangled so I use those wire tires to make it shorter. The device that turns on the noise cancelling feature is a little bulky but I'd rather not be included in the headset or the headset will be really bulky (don't look good at the gym). When you purchase it, it comes in a box with a hard cover carry case, airplane and stereo jack adapters, and 2 AAA batteries. Good purchase...I use it everytime I fly and evertime I am in the gym.
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