Here is a review left by a customer on a product. Would you say he was satisfied or dissatisfied?
Title: don't buy this one if you look for Noise cancellation headphone
Review: I bought this headphone because I am working on a lab with fans blowing. the headphone does surpress a little of the low frequency noise, but it also introduce a very noticeable noise of different frequency just as annoying as fan. So, if you really look for a noise cancellation headphone, try different one. Maybe the one I got is defective, in either case, I should say the quality control is poor. Overall, I would not recommend this product. Now I am using it as a regular headphone. BTW, the shipping is fast. I can not deny that.
