This digital interface is a must have! It converts USB digital interface to ST glass. It is well known that the ST glass is the best digital signal interface. One end of this USB Lightlink connects to the USB digital output of your computer (the USB is a horrible interface), and the signal comes out the entire end with a fiber optic ST Glass connector (the best transmission standard for digital!!). It means that you will need a fiber optic ST glass cable to connect from the output end of the USB Lightlink to your DAC - you of course must own a DAC that has ST glass digital input. It can be used with any DAC, not limited to the Bel Canto DAC3.5VB. Only the best reference DAC comes with the ST glass digital input. If your DAC doesn't have one, you should consider upgrading. If you have a reference DAC with ST glass digital input, and you are not using it, you are making a big mistake. It is like buying an SUV and not using the 4-wheel drive feature.

This is not a minor upgrade at all. You will definitely notice a difference. Priced to sell at $100 off MSRP brand new!! Only one left. Last chance for savings.