The NVR are Hikvision OEM NVR, manufactory is HIKVISION. About NVR IS Hikvision OEM 16CH NVR DS-7616NI-Q2/16P 16-ch 1U 16 PoE 4K NVR. Motion Detection 2.0. Video And Audio. Audio Output 1-ch, RCA (Linear, 1 KΩ).
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