But it doesn't sell stereos and personal computers in the U.S., the biggest market.

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There are a variety of simple headphones for personal stereos or MP3 players, and headsets with microphones for mobile phones.

BBC: NEWS | Programmes | Click | Click Essentials: Bluetooth

Even to the point that the value of what we do carry around with us has risen strongly in this past decade as we adopt smartphones and personal stereos.

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