Even if you do not have a system installed, these signs and stickers may make the burglar think twice. Make sure that all doors and windows have properly functioning locks. An unlocked window will surley be found if your house is targeted by a burglar. If you live in a mobile home, deadbolt locks and a reinforced door jam is recommended. Shrubs and bushes should be trimmed in such a way as you can clearly see out of your home's windows.
Thick bushes provide excellent cover for burglars from passing motorists or joggers.
Your home, vehicles and garages should be well lit at night. Remember to leave certain lights on if you are going out of town. If you want to get technical about interior lighting while out of town, buy yourself some inexpensive timers and set them for different nights and times. This will turn lights on and off, in different rooms, at different nights and times, giving the appearance that somebody is home. Don't forget to stop the mail and news papers, or arrange to have a neighbor pick them up if you are going out of town.