These can be combined with your cable TV or antenna system to achieve seamless integration.

This means that you can see who's at the front door... you can check on the baby... you can watch the kids at the pool... you can see who's calling on the phone... simply by changing channel on the TV you are watching (or even better as a box in the picture you are watching on TV).

Since this is complicated to arrange and install, do not try to do this on your own wihtout careful attention to details.