An urban legend says to use your car alarm for home burglar system http://www.snopes.com/crime/prevent/caralarm.asp I guess it could work; I hope your find it as amusing as I did. :D

actually it worked for me once ... its a car panic alarm though, not an actual car alarm .. anything that makes loud noise is good, doesnt mean it will stop the burglar or save a life, but neither will a home burglar alarm system .. they are all just pieces of a puzzle called security .