About Product:Item no: SH - 28 transmission range: 10 meters function: voice control, phone, support music, bluetooth/card processing custom: no printing LOGO: can bluetooth protocol: 4.2 track: stereo way of use: whether wearing type single and double ears: bilateral stereo applicable gift-giving occasions: opening ceremony, employee benefits, the anniversary celebration, the memorial, fairs, advertising promotions, holiday, wedding, pr planning, housewarming, birthday, business gift color: silver, black, gun color, rose gold whether cross-border supply of goods: no support for custom: does not support