HQRP Compact Stereo Earbud Headset w/ Microphone for Skype / MSN / Google / Yahoo / VoIP Internet Phone plus HQRP Coaster HQRP&reg; Stereo Earbud Headset w/ Microphone plus HQRP&reg; Coaster; Color: Black; Two (2) 3.5 mm jacks (microphone and headset); Headset: 50 - 20 kHz frequency range; 32W  10% impedance; 108  3 dB output sensitivity;20 mv maximum power input; &lt;5% at 1000 Hz 5 mw, sensitivity reduction. Microphone: 50 - 16 kHz fequency range; -58 dB  2 dB sensitivity; 0.5 mA maximum current consumption; &gt; 55 dB signal to noise ratio. 100 days warranty!