Operation voltagev37 42 modelhm1000 cable lengthcm30 materialplastic typeearhook general usesports fitness computer mobile phone cellphone functionsports volume control with microphone bluetooth noise cancelling communicationbluetooth connectorsusb memory capacitynone speaker diameter8mm speaker sensitivitydb83 speaker frequency response20hz 20khz microphone unit415 microphone spl542db10w01m microphone impedancekohm1800 microphone frequency resp