[legion]

I know that CMOS refers the type of electronic image sensor inside the camera. These make a HUGE difference in high-end photography, but not in a backup camera. As long as it has a high enough resolution to make out the image, you probably could care less about the kind of image sensor.

The only case that I can see where the image sensor might matter is if it is infrared, in which case you might be able to see a night with it.

As for other features, I'm not so familiar, so let us know what kind of features you have questions about.