About Product:Item no: v683 transmission range: 15 m function: power, according to the voice control, phone, support music, multipoint connection, the NFC function processing custom: is printed LOGO: can be bluetooth protocol: 4.1 track: stereo way of use: whether wearing type single and double ears: unilateral hands-free applicable gift-giving occasions: opening ceremony, employee benefits, awards ceremony, the anniversary celebration, fairs, advertising promotions, holiday, housewarming, wedding, pr planning, birthday, business gift colors: red, black, gold, rose gold, blue, brown whether cross-border supply of goods: no support