Product detailsMaterial:Abs,plastic,tpuCategory:Earphones & HeadphonesCharging Method:CableImpedance Range:Up To 32 ?Bluetooth Version:5.1Package List:User Manual,charging CableFrequency Response Range:20 – 20000hzFunction:Common Headphone,for Mobile Phone,hifi Headphone,sport,for Outdoor,for Office,for StudyActive Noise-cancellation:NoVolume Control:YesControl Button:YesVocalism Principle:Bone ConductionWireless Type:BluetoothCommunication:WirelessStyle:Ear HookCertification:NoneOrigin:Mainland ChinaProduct Name:Ks19 Bone Conduction EarphoneColor:White,green,black