A duplexer that includes an input filter, an output filter, and one or more of an isolation line and a delay line is disclosed. The method commences with a user selecting a menu heading which displays a pull-down menu in response to a first user input, such as a left pointing device button or a left mouse button. The predefined first threshold value is predefined to be smaller the longer the time since the internal combustion engine has been switched off. The first movement is different from the second movement.