USB Headset with Fold Away Microphone – Noise Cancelling Microphone & Inline Controls Ear headset Adjustable headband USB interface Fold Away Noise Canceling Microphone Inline Volume /-, Mute and microphone mute controls Lead-free components (RoHS compliant) Impedance: 32 Ω Frequency: 100 Hz – 20 KHz Sensitivity: 105 ± 3dB Cord length: 2.1 m / 6.8-feet Noise Cancelling Microphone: Back: 1.7 ± 0.1k Ω Sensitivity: – 33 ± 2dB Impedance: Front: 1.3 ± 0.1k Ω Frequency: 50 Hz – 20 KHz