Operation voltagev22v 43v modely668 input voltage v42v cable lengthcm0 materialplastic typeheadband general usemobile phone cellphone functionhi fi noise cancelling sports volume control dj with microphone communicationwireless bluetooth connectorsusb memory capacitynone speaker diameter30mm speaker sensitivitydb933db speaker frequency response20hz 20khz microphone unit4mmx15mm microphone spl383db10w01m microphone impedancekohm2000 microp