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Title: More like "noise blocking"
Review: I bought these for the commute (train). I am very unimpressed. Any noise reduction seems to come from the presence of tight-fitting plugs in your ears, rather than any electronic "magic". I can detect no difference in the background noise whether the noise-canceling circuit is turned on or off. The sound quality is poor either way. So this will be a returned product. The fact that replacement earplugs are unavailable seals the deal. The earplugs, while comfortable for me, are very thin and very soft. And very unlikely to stand up to daily use for very long.
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