Aiersenn R19 Dual Bass HeadphoneMaterial: PETMicrophone: YesVolume control: YesPlug diameter: 3.5mmDrive unit: 10.00mm * 2Frequency response: 20Hz-24000HzCable length: 1.2 metersSensitivity: 108±3 decibelsAnswer the call: press the button onceHang up the phone: short press or long press during the c..