The NVR Security System S4 Max (E8E00322) is compatible with PoE network cameras from the eufy Security range, but there is no official information confirming compatibility with models of E30 or similar wireless indoor cameras. For a reliable installation, we recommend using PoE cameras designed to work with an NVR, such as the models supplied in the original kit. If you wish to connect an indoor camera, choose a PoE model that is compatible with the system, as wireless cameras (E30 type) are not explicitly listed as compatible with this NVR in the official documentation. If in doubt, consult eufy technical support for precise confirmation.