The Headset Mate makes side by side training easy to achieve. A simple splitter that allows 2 RJ10 handsets to connect to one receiver allowing a both users to both listen and talk at the same time. Compact for storage when not in use RJ10 plug to twin RJ10 sockets (1x4P4C and the other 4P4C) for use with headsets with RJ10 4P4C plug.