The USB-ED 01 is a Sennheiser sound card cable which allows you to connect a Sennheiser Easy Disconnect headset to a PC. The cable contains a standard mono sound card and it works with any wired Easy Disconnect headset from Sennheiser and with any PC via the USB connection. The USB-ED 01 ensures easy connectivity when using softphones for managing calls. Benefi ts and Features: – Connect the Sennheiser Easy Disconnect headset to a PC via the USB port – Connect the headset to your softphone and manage calls – Change between different Sennheiser Easy Disconnect headsets – A blue LED lights up the cable to signal when it’s ready for use.