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We always find the earphone cord twisted together, making it difficult to sort them out. As there are requirements of people of different height, the length of headphone cord should be changeable. Therefore, we designed a new type of earphone. The earphone cord can be pulled out as long as you like with the help of spiral spring, turntable and other internal structures. After using it, we just need to move the slider close to earpiece and struck the button so that the earphone cord will retract into its case automatically. It is simple and convenient!