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transmission range 15 meters function call function, support music, multi-point connection bluetooth protocol 5.0 channel stereo how to use head mounted whether it is single and binaural bilateral stereo colorwhite,black,red,grey,black red,dark blue battery life 6 (hours) our company has always been adhering to the purpose of "striving for perfection and perseverance" for products, creating more benefits for more future partners and old customers,and achieving the goal of win-win cooperation.syi