Low power security camera system.

We’ve got a Swann home camera security system, which can be powered from our Delta 3. We’ve had it for years and it uses power quite well, in that one small power brick supplies power to the recorder and the 4 cameras which are connected via a BNC wire connection.
If we power it from our Ecoflow, it’s not too power demanding.
But it’s old now and it looks like it might need replacing soon.
Does anyone use a low power camera system which would be an even more efficient choice to use when we need to power it from our Ecoflow battery system?