Commax CMV77K 7inch wide LED display Multi VDP Single System Convertable via Smartphone. The 7-inch monitor which can also be connected to regular door cameras.If monitored in the MODUM system, this monitor can monitor 8 CCTV cameras and connect with guard and caretakers.With the CGW-M2I product, you can view lobby panel images and 8 common surveillance cameras online on 4 smart phones per unit only by connecting to the Internet and opening the door from anywhere in the world.Compatible with Single House and Apartment Complex.Monitoring & calling visitors and releasing door lock (Public entrance, individual entrance).Expandable up to 2 monitors, 2 door cameras and 2 Interphones.