About Product:Transmission range: 10 meters function: support music, phone, electricity display 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, birthday, awards ceremony, wedding, advertising promotions, business gifts, anniversary celebrations, public relations planning, fairs, festivals, employee benefits, housewarming color: black, red, blue, brown whether cross-border supply of goods: no support for custom: support