Hanging a rope of bells on the door might be a good basic digital-free alarm monitoring system, but these days it's usually a good idea to have something a little more advanced working to protect a home. And protection systems are important whether someone lives in an apartment or is lucky enough to own their own home. There are many ways that home owner can protect himself whether he's inside the home or is gone and most modern alarm systems are such that they can be easily installed and monitored either by the home owner or an external company.