Sennheiser Passive Box - UI710

The UI box works as a connector between your handset and headset. At the touch of a button, a passive box will enable you to easily switch back and forth between the handset and headset or even integrate a PC into the system if you wish. You can choose an active box with additional features that will regulate different volume levels and improve speech intelligibility - automatically. These boxes are absolutely user-friendly because they are easy to set up than traditional boxes.