Why doesn’t the Command Module alarm work when I press the red button on the headset?
see answer] There is no speaker in the command module itself. You will have to purchase a separate Alarm Module for that function. The red button on the headset is a standard option on all headsets. It will only work if an Alarm module is connected to a Command Module. The CSI-1100 mini module has a built-in alarm speaker and the headset will trigger the alarm if needed.