These products build on top of each other. pDetect behaves like an “eye” for detecting the presence of a person. pRecognize, in addition to being an “eye”, has “memory” to recognize the faces you have placed on the Safe List or the Watch List. pBehavior not only has an “eye” and a “memory” but also has “intelligence” to interpret behaviors such as loitering, crouching, prowling, and lying down. You can turn the notifications off/on separately based on your preference.