A:AnswerYou can add cameras with only motion sensing to the other 4 cameras. However the PIR Motion and Thermal detection have been the gold standard in home security for the past couple of years. This system has the option of using only Motion detecting, as well as both for more accurate recording (instead of falling leaves, or sheets moving on a line triggering it). If you have an older system it may only have pixel detection.
A:AnswerYes, you are able to connect the DVr to your router. This will allow you to view the cameras remotely through a compatible smart phone, tablet, and computer.