Most covert security and surveillance monitoring systems use a hidden color camera. There are definitely useful times when covert digital video recording is necessary and thanks to 21st century technology, the equipment for this purpose is not only available, but reasonably priced as well.
Covert digital video camera monitoring and recording is sometimes referred to as spy camera CCTV. Although the term "spy" may conjure up images of secret agents, under cover operatives and the like, a spy camera CCTV system can have very practical applications suited for every day residential and commercial applications.
If you need to keep an eye on someone without them getting an eye on you try using surveillance spy cameras. Actually, these cameras not only allow you to keep an eye on someone but also something like a pet, a house, a boat or some other type of property.