I have heard some models advertise ranges anywhere from 1000' to a half mile, but I haven't heard any reports on how accurate that statement is, or how long those batteries are expected to last pumping out signals like that. I have been eyeballing these for awhile too. Has anyone heard how hard they are to install? They are currently selling these over at the Summit Racing warehouse in the clearance section. I think they are made by Cobra and include, or can be coupled up with a fully featured security system(which is also on clearance BTW).