If the camera included in your original package is damaged or does not meet your needs, you can purchase additional cameras as per the following requirements:
For DVR wired kit/X5, you can add the camera with a BNC injector from a third party.
For NVR POE wired kit/X4, you can choose to purchase a POE camera that supports ONVIF from a third party after upgrading the system firmware to the latest version.