Four control buttons at the lower edge of the mirror are enough. In the left third of the cover glass are displayed the fare, tariff class, surcharge and the distance. If this mirror is installed in a Mercedes, the driver can control if the roof sign is switched on.

Of all the buttons is the leftmost 1 is the most important. With this button, if the driver has not been changed, the taximeter can be switched on. It can be used to choose for the right tariff class und to switch over to display everything needed for checkout. With the same button, 'Free' or 'Occupied' can be choosed.

The other buttons are used for printing a voucher, changing the base fare or the surcharge and to switch on or off the roof sign. All information about the tours and the drivers is additionally saved by the system. Each driver has a 'Cey' to show the system his/her presence.