About Product:Call lose range: 10 meters function: voice control, phone, support music, multipoint connection, the bluetooth/card/radio processing custom: no printing LOGO: can bluetooth protocol: 4.0 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, housewarming, pr planning, birthday, business gift color: black color, silver, platinum, black gold, black powder, white powder whether cross-border supply of goods: no support for custom: does not support