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Active Noise Canceling on a set of headphones indicates that the headphones are designed to detect the frequency of ambient noise (such as car engines at a racetrack) .
and then generate a tone that cancels it out.
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Unless the system specifically indicates that it is for use outside of the United States, it should not be used outside of the country. http://support.radioshack.com/support_tutorials/audio_video/audfaq-2BA1.htm#1B
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