Product informationBrand: Three StepsItem No.: M5Transmission range: 5 metersFunction: call function, support musicBluetooth protocol: 5.0Channel: StereoUsage: hanging ear typeWhether single or double ears: bilateral stereoApplicable gift-giving occasions: weddings, birthdays, holidays, housewarming, trade fairs, advertising promotions, employee benefits, anniversary celebrations, business gifts, opening ceremonies, awards commemoration, public relations planningColor: black, gold, silver,Packing listBluetooth headset x1