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We often encountered this situation during our life:We want to share movies or music with a friend but noise around us,This earphone design soveled the problem very well.It looks like ordinary earphone when only one person used it,however,each earphone could divide into two if we want to share.The black earphone can synchronize work once you push the button on the back.Magnetis in the rods make them easy to combine strongly,the combination and cables are made of rubber.
Tianjin University of Commerce