The DCU will allow for 2 CCTV cameras and 1 door panel as standard
Example:
1 x door panel & 3 x DCU that will allow for up to 6 CCTV cameras
2 door panels & 2 x DCU that will allow for up to 4 CCTV cameras
3 door panels & 1 x DCU that will allow for up to 2 CCTV cameras