Operation voltagev22v 43v modelq7 input voltage v42v cable lengthcm50cm materialtextile typein ear general usemobile phone cellphone functionsports volume control with microphone noise cancelling communicationwireless bluetooth connectorsusb memory capacitynone speaker diameter20mm speaker sensitivitydb1053db speaker frequency response20hz 20khz microphone unit4mmx15mm microphone spl353db10w01m microphone impedancekohm2000 microphone freq