Andrea Electronics C1-1021450-1 model USB-SA-1 High Fidelity External Digital Sound Card with Noise Reduction Technology Removes the Uncertainty of Legacy PC Audio Quality and Compatibility Issues, Hi-fidelity external sound card with CD quality digital sample rates USB 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 audio Small 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 peripherals Can 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 Indicator Win98 SE / Win 2000 / Win XP and Vista Compatible, Mac OS9/10 (without Andrea Software) Compatible, Includes Andrea's complete PureAudio Voice Solutions Software Suite