It doesn't tell you 'Stay Away,' it tells you 'We have a security system,' and if you're familiar with that system, that's not a heck of a lot of a deterrent for you. Alarm company signs may deter nonprofessional burglars, however. And some security companies offer cell phone service that protects against burglars who cut the phone lines. Burglars always look for a good entryways into houses. Back doors that offer lots of cover from neighbors and traffic on the street are the best.
Robbers also love doors with glass windows and butterfly locks.
The windows can be smashed, allowing them to reach in and unlock the door without a key. Once the alarm is disabled and the burglar is inside, he will most likely head to the master bedroom. That's because a lot of people keep cash there along with jewelry. The next stop might be a child's bedroom. A few years ago, it might not have been worth the time.