The information I have does not give a clear answer as to whether multiple cameras can be connected to the same monitor or if there are add-on cameras. It seems that the Momcozy products generally have one camera per monitor, but specific details on expansion options are missing.

The babyphone's camera is battery-powered, which means it has a certain amount of autonomy. However, I don't have any precise information on whether it needs to be constantly connected to the mains. It's likely that it can be used without being constantly connected to an electrical socket, but this depends on how long it's used and the capacity of the battery. For more details, it would be best to consult the user manual or contact Momcozy customer service.

No, the Momcozy "Baby Video Monitor (Video and Audio, 300m)", with product ID BM007-WH12BA-A, does not allow images to be viewed on a phone app. This monitor works without Wi-Fi and images are transmitted directly to the parent unit via a dedicated wireless connection, without the need for a network connection or phone app.