A:Answer Extra cameras can be found at the official Swann website, several other online retailers, and possibly right here at BB.
After completing my initial install including connecting my DVR to my network, the DVR received a firmware update that added 4 IP Channels for a grand total of 24 channels.
This update will now allow the system to expand beyond 20 wired cameras with an additional 4 WiFi enabled IP Cameras, or 4 Ethernet wired cameras.
IP camera compatibility varies. I tested an indoor wifi camera with (Onvif, FTP, HTTP, uPnP) capability. This allows for most 3rd party software to operate this camera 24/7 without the need for a dedicated app. This type of IP Cam is required to work with this DVR.
IP cameras must be connected to the router (wifi/ethernet) in order for the DVR to recognize and complete the setup of said IP Cam.
I personally bought 4 Swann 1080p Wifi cameras to partner with this system. Unfortunately, the cameras I chose would not work with this system. The cameras were a stand alone system designed for app usage only. So buyer beware!! Also, if IP Cameras are added to your system, there is a setting in the DVR that changes the DVR to an XVR. This enables hybrid mode.
Hope this helps