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How to use the alarm inputs on your Dahua NVR - How to connect alarm sensors to your NVR - Tutorial - YouTube
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DHI-NVR4216-16P-4KS2 | DAHUA 16CH 4K NVR, 320MBPS, 1 Independent 1000Mbps Ethernet Port, 16 Ports PoE, HDMI/ VGA Output , 2 USB, 2 SATA UP TO 8TB Each with 4Ch Alarm Input and
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