Superior Sound: Headphones isolate and reduce external noise while minimizing noise leakage for a long-term comfort experience in your ears.Product name: wired headsetUnit size: 40mmImpedance: 32 ohmSystem frequency response range: 20Hz-20KHzCable length: 2.5mSensitivity: 98dBPlug: USB plugYou can take it in your backpack easily, perfect for you to carry on business or travel.If you have any questions, please contact us in time and we will respond to your inquiry within 24 hours.