Transmission Range: 10 meters Functions: Battery display, call function, NFC function, voice control, music support, multi-point connection Audio Channel: Stereo Usage Method: Over-ear Single/Dual Ear: Dual-sided stereo Suitable Gift Occasions: Wedding, birthday, festival, housewarming, trade show, advertising promotion, employee benefits, anniversary celebration, business gift, opening ceremony, award ceremony, public relations planning Hign-concerned Chemical : None Material : Plastic Battery Capacity[mAh] : 600 Maximum wireless range[m] :