Because for a detector to undetectable requires a case design that doesn't 'leak' any radar signal. A case like that doesn't lend itself well to having GPS inside it. The only thing that is the best of all worlds/features is the Bel Sti-R Plus installed unit. It accomplishes that because all the components are separated out.
I just went from the Escort 9500ix to the Redline. Way better range and undetectable but false alarms went up. I added Escort Live which let me sync it with my phone and use the app to lock out all the false alerts. Not a bad solution IMO.
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