The JPL Element TT3-AVANT-B is supplied as a complete binaural headset with a PLX Quick Disconnect (QD) connection. Giving you the option to switch from monaural headband to binaural headband with one simple click. It is designed to provide the user with the choice of wearing styles on demand, as well as giving notable cost savings and a longer headset life. This headset requires an additional JPL bottom lead to connect to your desk phone.