This kit will give you 4TB of storage

For 2TB hard drive: Almost about 26 days（4MP）,it depends on the resolution. If you want to if you set recycle record for this system: Please kindly go to System Setup--Channel Setup--HDD Setup to check 'Overwrite',then the system will automatically cover the earliest video file and continue recording.

You can add more 8pcs cameras.

We’ve improved the volume of the speaker so that it can be used as a siren, which is loud so you can use it to ward off intruders. Control the Siren feature from the ZOSI app.

The camera can work without an NVR. Yes, the C186 security camera system supports 24/7 non-stop.

Yes, there is a 4TB hard drive already installed inside the NVR.