Very easy setup Y training adapter splitter that you can plug into either the telephone handset port or headset port and the adapter splitter will give you two more ports to headset or handset corded plug in. Now both users can simultaneous listening / talking into one conversion via this adapter.

the adapter cable length:0.5M(20inch). The RJ9 Telephone Training Splitter Adapter for Ip Phone. Incoming calls outside the phone, two all the phones ring, and any call can be made to talk to the outside;When you need to make a call, you can use any of the two phones. Great use for Telephone RJ9 4P4C Training Adapter Y Splitter for Headset or Handset splitter for office phones,call center / telephone marketing training;Easy setup, plug and play. The plug on the cable is 4P4C,Complete with RJ9/RJ12 plug.