From Guns.com:

The MRS line of optics is really where Holosun is making waves in the community, setting themselves apart. Starting off, the MRS TH is a digital thermal optic that can record, zoom from 1-8x, change the intensity of the screen, and change the color of the thermal (white hot, black hot, etc.) 

The MRS NV is the night vision version of the rifle optic, offering the same features as the thermal. The NV also includes an IR illuminator on the side of the optic.