Operation voltagev34v modelm1 input voltage v34v cable lengthcm1mm materialaluminium typein ear general usemobile phone cellphone functionbluetooth with microphone communicationwireless bluetooth connectorsusb memory capacitynone speaker diameter20mm speaker sensitivitydb10mv speaker frequency response100hz microphone unit70db microphone spl70db microphone impedancekohm2 microphone frequency response5v max input power8w driver typeelectrost