Earbud headsets look much like the earbud headphones you use to listen to your favorite portable music player, except they include an in-line microphone.
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While not as compact as the earbud style, they typically provide better voice reception.
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There are variations that are earbud style, similar to a set of iPod headphones.
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Retractable headsets are available in both earbud and boom style, except here, the cord can retract to avoid tangling.