Full covert cameras are Black flash, which is an invisible flash technology that is used to take photos of targets without them being alerted to it.
Black flash cameras will give colour photos by day, but black and white photos at night.
Reconyx HP2X Hyperfire 2 Professional Covert IR Camera
Reconyx PC900 Hyperfire Professional Covert Camera
Reconyx XP9 Professional Ultrafire Full Covert Camera