We purchased the Cortex camera system after reading the reviews. All I can say is they are the best investment we have purchased in a long time. We live in a really dark area and I had some concerns about the night vision. As it turns out, we can see just as good at dark as we can in the daylight. I give these cameras a 5 star plus. Anyone looking to invest in a great quality in security cams ? Then these are what you need. Thank you to Cortex for providing these great products.