DAHUA NVR4104HS-P-EI Or NVR4108HS-P-EIOr NVR5216HS-16P-EI. Up to 6TB of optional hard disk space (pre-installed, if chosen). changing, audio detection, no SD card, SD card full, SD card error. · Alarm: 1 in, 1 out; audio: 1 in, 1 out; supports max.
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