This BL-11-USB+P USB (Y) Training Lead comes with three sections: Trainer/supervisor section, Trainee/agents section and connects via USB to your laptop or computer. Once the training cable is connected to your laptop or computer there are now the trainer/supervisor and trainee/agents sections open and waiting for headsets to be connected. The cables trainer section features a rocker switch that can mute the microphone. This provides the trainer with the ability to manage who is speaking during the call. When the switch is set to the full circle, the trainer can speak while the trainee is muted. However, if the switch is flipped to the half circle, the trainee can speak while the trainer is muted. The speakers audio output remains active throughout the call, allowing both the trainer and trainee to hear whats being said.