OvisLink Call Center Headset Training Adapter &#9989; OvisLink Training Adapter connects two headsets to one telephone. Both connected headsets can talk and listen. Mute buttons to mute any one of the connected headsets anytime. &#9989; Compatible with all RJ9 headset with RJ9 connector included wireless headsets &#9989; Package comes with an OvisLink Training Adapter, a short RJ9 to RJ9 cord and a short RJ9 to 2.5mm cord. (To use the training adapter with telephones with 2.5mm headset jack, read the product detail description) &#9989; Simple to use, Plug and Play, No software installation &#9989; Comes with with 2 YEAR WARRANTY AND 30 DAY GUARANTEE  We stand behind the quality of every one of our products which is why were happy to offer you a 2 year warranty and 30 day guarantee on your Ovislink headset training adapter.