4 Zone panel, expandable. Allows CO and NO2 simultaneous detection in the same loop, can control up to 16 detectors with possibility to programm up to 2 groups, allows to realize individual manoeuvres in the case of different gases or sectorize manoeuvres if its the same gas. Especially design to protect underground parking, workshops, garages and small installations. three wires communication and directionable. Includes spanish and portugese regulation in three language. Each zone includes a LCD display that works independently.