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If people want to transmit data, listen to the music, or charge their smart phone, they must carry USB transmission line and earphones with them. However, it is really inconvenient. You usually miss one of them, and even your phone when you are in a rush to the office or school. Now with the new-designed USB transmission line which serves the function of earphone, you will solve this problem. Meanwhile, the part which fixes lines of earphones to the transmission line can forms a fashionable and convenient necklace, making users unnecessary worry about where they can put their phone.