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Hi, Lili! Remove its battery cover on the left housing of the headphones. You may refer to this link for more information (How to use): https://www.sony.com/electronics/support/res/manuals/4743/da265ba85491320863fd7b2651202bb7/47438071M.pdf ~Ralph
Sorry, there was a problem. Please try again later.Just open the panel on the ear piece and remove.
Sorry, there was a problem. Please try again later.
