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Why don't hands-free sets output in both ears?
I've always wondered this. Seems it'd be nifty (and a lot easier in some certain circumstances) to hear a cell phone conversation in both ears, rather than having to filter out external noise. My wife has an earbud set that has jacks for both phone and music player, but when you use the phone, only one earbud has sound coming through it.
Is it for a technical reason? Or is it for safety, i.e. you're not supposed to wear headphones in the car because you need to be aware of your surroundings?
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