>>> This NVR is Hikvision original Version,support official update firmware! Hikvision Original 64-ch 2U 4K NVR DS-9664NI-M8. Hikvision APP : hik-connect, guard viewer, IVS-4200. NVR: DS-9664NI-M8. HDMI 1 Output 8K (7680 × 4320)/30 Hz, 4K (3840 × 2160)/60 Hz, 4K (3840 × 2160)/30 Hz, 2K (2560 × 1440)/60 Hz, 1920 × 1080/60 Hz, 1600 × 1200/60 Hz, 1280 × 1024/60 Hz, 1280 × 720/60 Hz, 1024 × 768/60 Hz.
eBay