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The earphones that we use today cannot amplify the sound to the extent that everyone can hear. This pair of earphones contains a physical amplifier. The earphones turn into a sound-amplifying device once they are stuffed into the amplifier. The design of the amplifier can also prevent the earphone wire from getting tangled.
Dalian Minzu University
Dalian, China
Xuefei Liu Di Fang Cheng Yang Huan Li
