While doing some research I came up with this link
http://lasershield.net/This is an inexpensive alarm system, - that can be used in a home a trailer or anywhere there is a phone line and electricity.
Even if you have an alarm system in your home this appears to be a nice backup system.
No I do not sell them but I have met with a company representative and I am considering if I wan to use this system to supplement my current security precautions.
Have any of you bought one of these yet?