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Sometimes falls earphones from your ears.
Or, if you have a different ears than other people like big ears, small ears,and ears size of both is different.
So, how to fixed your earphones in ears? how to share with your friend? If you made a earphones considering the size of your ear. you can't share with your friend. so, I thought if i can cotrol size of earphones i will fixed earphones with my friend. and then,I made my prduct. you can control earphones's size by liquid jelly. the process is the same as the syringe. if turn to left, earphones become small. if turn to right, earphones become large.
new taipei city, Taiwan