Compatible with : Blackwire 5210, Blackwire 5220. For Blackwire 5200 series only. Not for any other Blackwire models that use a 3.5mm jack. Blackwire 5210, Blackwire 5220. The 3.5mm y-training cable connects two Blackwire 5200 USB headsets to the USB port and monitors or trains.
eBay