None of our DVR system require an internet connection to be used locally. The internet connection is used to allow remote connection using a smartphone app or PC client. These features won''t be usable, but the system will still work as a local security system with recording and storage. 

These articles may help you:

• What kind of hard drive can be used with our DVR / NVR?

          https://support.zositech.com/hc/en-us/articles/234712147-What-kind-of-hard-drive-can-be-used-with-our-DVR-NVR-

•  How to set up record and playback on DVR / POE NVR / Wireless NVR?

          https://support.zositech.com/hc/en-us/articles/234712387-How-to-set-up-record-and-playback-on-DVR-POE-NVR-Wireless-NVR-

Please let us know if you have any further questions:

Our Whatsapp:  +1-866-841-6932

Support Email address:  service@zositech.com

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Support center: support@zositechhelp.zendesk.com