This is the "Blue" version S/PDIF to integrate a digital transport or music server to a DAC (Logitech's Squeezebox, iPod Dock). This is a very nice cable, giving one the right to use the terms "smooth" and "digital" in the same sentence. It's 4 feet in length and in near perfect condition. Check out some of the many positive reviews and comments from WyWire's website. Price includes shipping via USPS, with NO PayPal add-on fee. In the process of making a few changes, so please check my other listings.