The DRS-TH puts a thermal image right behind your red dot, so you see the heat signature and your dot in the same window. Flip the front cover down and it runs like a regular closed red dot. It's built for hog and predator hunters who want thermal on a fast 1x sight without hanging a full thermal scope on the rifle.
Product photo: Holosun. Specs per the manufacturer; call to confirm the exact model in stock.