Andrea Electronics High Gain Pure Audio USB External Digital Sound Card with 3.5mm Powered Stereo Microphone Input, Patented Noise Reduction Technology and +30dB Microphone Boost Circuit USB-SA Note: This is the original High Power version of the SP-USB-SA-HIGH-GAIN with up to +30dB microphone boost (PC only). This product is available exclusively at The Sound Professionals. External Digital Sound Card With Patented Noise Reduction Technology. Increase intelligibility and performance of microphone input and stereo speaker output with patented noise reduction technology enhancing your digital audio applications.. Your microphone will perform only as good as the sound card or integrated audio system that it is attached to. 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. 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.