headphone with mic mini headphone with mic retractable headphone with mic retractable earphone with micDrive unit: 40mmspeaker impedance:32 ohm ±15%speaker sensitivity:107db ±3dbspeaker frequency response:20-20, 000Hzmaximum power input:50mwmicrophone impedance:2.2Kmicrophone operating voltage:4.5Vmicrophone sensitivity:-54db±3dbmicrophone frequency response:100-16,000Hzwork with all ...