Transmission range: 10 m Function: support music, call function, power display, multipoint connection Bluetooth protocol: 4.1 Vocal tract: stereophonic Way of use: neck hanging Single and double ears: bilateral stereo Applicable occasions gifts, opening ceremony, birthday, wedding, anniversary awards, advertising promotions, business gifts, anniversary celebrations, public relations planning, fairs, festivals, employee benefits, on the move Package Details: 1 x Bluetooth Earphone Warranty : Checking Warranty report us with in 24 hrs in case of damage in transit