That is the percentage of external noise that promises to reduce the new headphones Pioneer SE-NC31C. The disadvantage of these active systems is that they need power to operate, in this case one AAA battery. Autonomy in this model is 120 hours, but if you want to use noise reduction should not worry about the length.
Details like the frequency response of 5 to 16,000 Hz or a 3.5 mm gold plated headphones can make you see these as some future events. You'll have to pay about 60-75 euros.
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