Your headset, microphone or speakers will perform only as good as the sound card or integrated audio system that you plug into. Most laptops and PCs today have audio systems built in and it is often placed close to noisy components like the power supply or high frequency processors. In addition, PC's may be used in high noise level environments which can affect the performance of applications, such as those that use speech input. Andrea's PureAudio USB-SA with patented noise reduction technology eliminates noise problems as it utilizes high quality digital circuitry and has state of the art noise reduction algorithm software. This format bypasses your desktop or laptop computer's sound system, providing increased intelligibility and performance of stereo microphone input and stereo speaker output for all of your digital audio applications including VoIP and speech recognition programs. Removes the Uncertainty of Legacy PC Audio Quality and Compatibility Issues, USB 2.0 Full Speed Operation Device Class Specification V1.0 Compliant (Digital Audio Device), USB Stereo Microphone Input and Stereo Speaker Output, Small Form Factor is Convenient for Portability with Audio Peripherals, Power On / Data Transmit LED Indicator, Win98 SE / Win 2000 / Win XP and Vista Compatible, Mac OS9/10 Compatible, Available with Andrea Voice Solutions Software Suit. Microphone Jack 3.5mm: Pink (PMS 701C), Speaker Jack 3.5mm: Green (PMS 365C), Power: USB, Microphone Input: 2 Channel Stereo, Audio Output: 2 Channel Stereo, Sampling Rate: 48K / 44.1K Hz / 16K / 8K, Supply Voltage: 4.5 - 5.5 VDC, Total Power Consumption: 120 mA, A/D Conversion Resolution: 16 bit, THD + N: -84 dB, Supply Bias Resistor: 2.2K Ohm @ 3.3VDC, Frequency Response: 20-20,000 Hz, Boost Gain: 20 dB, Input Range: 0 - 1.25 Vrms, Dynamic Range: 95 dB, Record Gain Range: -6 to 33 dB, D/A Conversion Resolution: 16 bit, THD + N: -91 dB, Frequency Response: 20-20,000 Hz, Output Load: 32 Ohm, Output Voltage: 1.27 VrmsRemoves the Uncertainty of Legacy PC Audio Quality and Compatibility Issues, Hi-fidelity external sound card with CD quality digital sample ratesUSB 2.0 Full Speed Operation Device Class Specification V1.0 Compliant (Digital Audio Device), Converts the built-in sound of the average desktop or laptop into a rich audio experience designed for PC users who insist on high quality/low noise audioSmall form factor, about the size of a thumb drive, is convenient for portability with audio peripherals, The USB adapter enables the audio device driver platform which supports the Andrea PureAudio noise reduction technology and Andrea hardware peripheralsCan also be used to enhance ANY existing legacy headset, microphone or speakers, USB Stereo Microphone Input and Stereo Speaker Output, Power On / Data Transmit LED IndicatorWin98 SE / Win 2000 / Win XP and Vista Compatible, Mac OS9/10 (without Andrea Software) Compatible, Includes Andrea's complete PureAudio Voice Solutions Software Suite