I've heard of some GM (cadillac) vehicles that have a keyless entry system that does not require a remote. basically what happens is once you get within a certain distance of your car, a chip (or some other device), transmits a signal that unlocks the doors. ok, so its obviously i'm not real sure of the mechanics but it sounds really cool.
has anyone heard of it? know where i can find information on it? any aftermarket retailers selling it?
drop a line. thanks.