They are not an new and old model. The difference is the QC20 is for Android, BlackBerry, Windows operating systems and has a two-button remote that can be used to answer phone calls and toggle the Aware Mode on and off, while the QC20i is for the Apple iOS system and has a four-button remote with all of the same features, plus volume, music control, and voice commands.
10 years, 5 months ago
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