Hi,
I'm evaluating/comparing those two cameras:
DS-2CD2D25G1/D/NF
DS-2CD2D25G1/M-D/NF
from the pictures on the website it seems the difference in terms of HW is the use of a pinhole lens or M12.
If I look at the series 2 naming table the "M" in the product code should stand for HDMI... but...