The SignaLink USB combines the legendary performance of our SL-1+ with a state of the art built-in low-noise sound card. This innovative design offers many advantages over traditional sound card interfaces that must use the computer’s sound card. These include optimal performance, greatly simplified installation and operation, and the ability to easily run multiple interfaces on one computer at the same time. The SignaLink USB supports ALL sound card Digital and voice modes. This includes “legacy” modes such as RTTY, SSTV and CW, as well as today's most popular modes like PSK31, MT-63 and EchoLink. Performance on all modes has been optimized by the use of special low-noise parts and careful design techniques, while convenient front panel controls let you adjust your Transmit Audio, Receive Audio and Transmit delay "on the fly". The SignaLink USB is designed and manufactured using only the highest quality components. Assembly is done using “state of the art” robotic production equipment. Strict testing of every unit, and our high level of quality control insures you of a premium quality product that will provide many years of dependable service. A great deal of effort has gone into the design and manufacture of the SignaLink USB, and we think you’ll agree that we have offered a level of innovation, quality, and value that cannot be beat!