Enhance your listening experience and reduce unwanted ambient noise by 87.4 percent with the MDR-NC7 noise canceling headphones. Featuring a convenient, foldable and swivel design, these headphones are perfect for travel or the daily commute. There's even a convenient, dual-use capability that gives you the option to listen to your music with or without the noise cancelation feature."Noise canceling technology"-Noise canceling headphones reduce ambient noise and provide a quieter environment to enhance audio entertainment. The headphones have an inside microphone on each earpiece that work with an electronic circuitry to create an opposite sound wave to reduce wave. Ambient sound is reduced by synthesizing with a sound in opposite phase produced by the noise canceling circuit.