Although it doesn't completely block out external sounds, you can definitely hear the effect of noise reduction when you turn them on in noisy environments. The environment becomes noticeably quieter. It's very relaxing to listen to music in the metro. The buttons are conveniently located and simple to use. I owned a few different brands of wireless in-ear headphones, but it was hard to take calls because the other party could barely hear me. This is not a problem at all. The headphones met expectations.
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