Multimedia stereo headset with adjustable mic boom #cas-cnl-me-128. Features: comfortable headset allows long duration of use. This headset with its fashion design has been created to be used with multimedia, gaming, internet and ip phone application. Speaker: 40mm. Sensitivity:101 +/- 3db. Impedance: 32 +/- 15%. Frequency response: 20-20000hz. Rated power: 25mw. Microphone unit: 6*5mm-58 +/- 2db. Plug type: 3.5Mm stereo.