This kit will give you 2TB 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.

After you install a SD card in the camera, and set the full time record or motion record, then you use the app to view the picture, there is a playback button under the picture.

You can add more 4pcs 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 2TB hard drive already installed inside the NVR.