G-Sound Stereo Headset with Volume Control headset

G-SOUND Stereo Headset with Volume Control <ul><li>Adjustable headband and microphone for comfort &amp; convenience</li><li>Leatherette padded ear cushions &amp; headband for wearing in long time</li><li>Detachable microphone for regular headphone application</li><li>Detachable microphone also could be used as mini microphone in NB</li><li>Cord length: 250 &plusmn; 10 cm</li><li>Connection to PC: audio jack</li></ul><br />Speaker specification:<br />Frequency Response : 20Hz~20 kHz<br />Impedance: 32 O<br />Sensitivity: 116 &plusmn; 4 dB<br />Max. input: 100 mW<br />Microphone specification:<br />Impedance: 2.2 kO<br />Frequency: 100~10 kHz<br />Sensitivity: -54 &plusmn;3 dB<br />.