About Product:Brand: Neutral transmission range: 10 meters Function: Support music, voice control, call function, NFC function, power display, multi-point connection Bluetooth protocol: 4.2 channel: Stereo use: Head-mounted whether single or both ears: bilateral stereo Applicable gifts occasions: advertising promotions, business gifts, anniversary celebrations, festivals, trade fairs, housewarming colors: black, white, red, blue support order: support