PRO Vision DVR SH-4100A5N-2L 2MP 4CH 2TB
PRO Vision DVR SH-4100A5N-2L 2MP 4CH 2TB.

The recorder sets the ceiling for the whole system: channel count, maximum resolution and the total bitrate it can write to disk. How far back the archive reaches depends on drive capacity, camera count and whether recording is continuous or motion-triggered, so work the days out in advance. Check that it speaks the cameras' protocol, and change the default password at install.
Product identification
Manufacturer part number: SH-4100A5N-2L. Use it to confirm that accessories and spare parts match.