<b>Information</b><br> <b>Speaker</b><br> Driver Unit: 40mm<br> Impedance: 32Ω<br> Sensitivity: 106±3dB (at 1mW/1Khz)<br> Frequency Response: 20Hz-20KHz<br> Max Input Power: 100mW<br> <b>Microphone</b><br> Impedance: 2.2kΩ<br> Sensitivity: -58±3dB<br> Frequency Response: 30Hz-16KHz<br> Directivity: Omnidirectional<br> Length of Cord: 1.8m / 5.9 Feet<br><br> <b>Buttons</b><br> + Increase the volume<br> - lower the volume<br> Single click the middle button can Answer Call/End Call/Play Music/Pause Music<br> The built-in microphone is on the back of buttons<br> The buttons are not work for computers & laptop<br>The microphone is not work for Desktop PC