Visit Amazon site : br Andrea Electronics C1-1021450-1 model USB-SA-1 High Fidelity External Digital Sound Card withbr br Removes the Uncertainty of Legacy PC Audio Quality and Compatibility Issues Hi-fidelity external sound card with CD quality digital sample rates br USB 20 Full Speed Operation Device Class Specification V10 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 qualitylow noise audio br 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 br 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 br Win98 SE Win 2000 Win XP and Vista Compatible Mac OS910 without Andrea Software Compatible Includes Andreas complete PureAudioTM Voice Solutions Software Suite