From the Manufacturer
http://www.zalman.com/global/product/Product_Read.php?Idx=755
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Mfr Part Number: HPS200
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Features:
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Best sound quality headset for all kinds of usage
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Clear sound with no disturbing noise
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Freely adjust the position of the flexible microphone. Deliver clean speech in a variety of applications
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Easily control volume through volume control device
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Covers sound of all range with high quality unit
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Enjoy high quality sound with no interruption
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Adjust to your size for comfortable fit
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Flat cable applied to prevent cable from twisting
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Long length cable for convenient usage even when having a distance from the PC
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Connector: 3.5 mm
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Frequency Response: 20Hz - 20,000Hz
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Headphone Sensitivity: 118dB
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Microphone Sensitivity: -54dB ± 3dB
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Impedance: 2.2Ω
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Max power: 20mW
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Weight: 275.0 g (w/ cable)