Multiplex Technology 4CH H.264 - Manual (Page 36)

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Item Description
Automatic Synchronization
Check to enable DVR automatic synchronization function. Select this
option to enable the function, DVR will automatically synchronize the
time upon rebooting or by every 24 hours after booting.
Update Now
Date and Time show on DVR will immediately correspond with those in
internet server.
4.9.3 Device Setup