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It use IVMS-4200 ,The firmware is stable, please do not upgrade the firmware yourself.
If you use it alone,
It cannot call HIK-CONNECT directly.
It must be based on an indoor monitor.
Such as DS-KH8301-WT or DS-KH1310-AL or other models of indoor monitors,
HIK is designed this way;
But if you don't have a monitor,
It can directly call the computer client IVMS-4200, video call and access control;