motorcycle helmet movement stereo 4.2+edr muti-function helmets bluetooth headset y20

motorcycle helmet bluetooth headset helmet movement bluetooth stereo.feature.:.using.the latest 4.2+edr bluetooth technology, superior signal transmission,.ultra-low power consumption, all bluetooth devices are charged, support.for automatic answering function, no need to answer the phone manually.when calling, safe and fast, large button design, male the choice.for riders..built-in.high-quality anti-interference microphone, external windproof sponge,.can effectively realize hands-answ