Security should always be a priority, and any way that a person can feel safer in his or her property is a good thing. A wireless motion sensor alarm system is one of those ways; it effectively allows you to keep a general eye on your surrounding area, and being wireless, it is incredibly easy to install and with current long ranges afforded by these systems, you can cover the end of the driveway and outbuildings too if you have to. Newer models have the added functionality of differentiating between a human and an animal such as a pet dog or cat, which was one of the limitations of earlier models. Combined with a wireless surveillance camera system to deter and if necessary capture footage of a crime, this set up will certainly make you feel more secure in your home.
So, combined with other systems, a wireless motion sensor alarm can be very effective. Even on its own, it can be a worthwhile investment. The problem that most people have is that they forget that there are severe limitations on what a security system can do, and almost act to encourage those limitations. Some of these problems are simply because people tend to overestimate the ability of a system to protect themselves; they tend to figure that a security system will prevent attacks. Whilst undoubtedly their is a significant preventative element to a visible alarm system, the risk of burglary or other criminal activity remains. The key function that remains is to notify the homeowner that there has been an incident, and where monitoring services are also employed, immediately contact the emergency services.
Obviously, this is not to say that a wireless motion sensor alarm is worthless. Rather, it is to point out that the defender needs to have a plan when the alarm goes off beyond simply hoping that the police get there in time. Certainly though, an alarm system that includes motion sensors will give you every possible chance of being notified of a home invasion and allow you to act to mitigate the effects.