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Yes, it does.
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Yes, As long as your headphones have a micro USB interface, it’s fine.
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You do not need a cell phone to use them as an intercom. Pairing the bluetooth helmet headset with a cell phone will let you make phone calls , listen to music, or preview the shooting screen.
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It can work quite well on a half helmet, but beware that as the CVC noise filtering is, if you don't have a windscreen and wearing a half helmet you might still get some noise in calls. Otherwise all good!
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Music is clear and the quality is worth the money. We listen to music and talk via bluetooth while riding.
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YES, all devices with bluetooth function
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No, music only or intercom only.