The USB (Universal Serial Bus)-ED 01 is a Sennheiser sound card cable which means that you can connect a Sennheiser easy disconnect headset to a PC. The cable contains a standard mono sound card & it works with any wired easy Disconnect headset from Sennheiser & with any PC via the USB (Universal Serial Bus) connection. The USB (Universal Serial Bus)-ED 01 ensures easy connectivity when using soft phones for managing calls.