About Product:Transmission range: 10 meters function: 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: bilateral stereo 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, blue, black, gold, silver, rose gold, black gold, black and pink downstream of the main platforms: wis