Operation voltagev37 42 models7 input voltage v37 42 cable lengthcm30 materialmetal plastic typein ear general usecomputer mobile phone cellphone sports fitness functionbluetooth noise cancelling sports volume control with microphone communicationbluetooth connectorsusb memory capacitynone speaker diameter8mm speaker sensitivitydb95 speaker frequency response20hz 20khz microphone unit415 microphone spl542db10w01m microphone impedancekohm180