Thanks to Darwin Barton
Most home alarm systems have the usual door sensors where when you open any door on the perimeter of the house it will set off the alarm or at least ring with a chime sound. I highly recommend if you are looking at adding home security to your house that you take a look at the ADT home security sensors that they use for windows and other openings that are more than just doors. I personally wanted window sensors because I live in a ranch style home where all of my windows are on ground level. If someone knew I have an alarm system on my home they would assume that the doors are secure but they would also probably assume that the windows are not. This is why it is so important to make sure you secure all of the openings on your home with contact sensors. You will notice that when you open any window or door it will tell you on the control panel which window or door it is. This is what makes me feel so much safer in my home.