R9 SINGLE WIRELESS EARPHONEProduct description New Bluetooth 5. 3, more stable and faster connection. Life grade waterproof, all round protection, no damage to the earphone even if you sweat profusely, anti stain erosion, long lasting and durable, no fear of sweat and rain. With subwoofer composite diaphragm speakers, high efficiency Bluetooth transmission efficiency is richer in details and layered experience. Ergonomic design, the golden ratio is superimposed three times, it
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