Current homeowners have a wide range of options available to them, despite the fact that their walls are finished. There are many wireless devices on the market that perform nearly every function you can think of. Many of them communicate directly over your home's pre-existing wiring. All you need is an outlet to plug into.
We also have products that allow vacation home and cabin owners to remotely monitor the status of their secondary dwelling. These systems can monitor for temperature and water and alert you if a problem arises. View some of the available products here.