Its hit and miss to be honest. They do have a day/night mode. One camera is indoors in a shed - it picks up moths (as birds) and even a bat a couple of times. One camera that is outdoors regularly detects the fox that visits us almost every night. However another camera pointed at his next destination never picks the fox up at all. The main difference between the two camera environments appears to be third party lighting - there are street lights in the direction of the one that does not detect the fox, and also the glow of a robot mowers charger light. One or both seems to be putting off the cameras ambient light sensor and prevents night mode from kicking in. The simicams do have some configuration for night mode also, none of which I have tried out yet. Options like infrared lamp vs white lamp vs dual, and day-night mode of "photoresistor" vs "scene brightness" and also some "color to black luma" and "black to color brightness" settings. I should really play with those some more, but they've been left as defaults so far.