Stops background noise... totally.

The volume in the headset is on the low side with my Nokia phone. There does not appear to be any way to boost it.

I hooked these up to my cell phone, got on the highway, opened all my windows at 70MPH, and cranked my radio full blast. With all this noise, I then left myself a voicemail and later retrieved it. There was no noise... the noise cancelling technology did the job and then some.

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All varieties of earbuds, lapel mikes, etc...