The Bel STi Driver radar detector is absolutely invisible to Spectre II, Spectre III, Stalcar, VG2, VG4 radar detector detectors, used by police to find out who is using a radar detector. RDD is the tool police use that searches for the IF (intermediate frequency) which all radar detectors use as a reference to detect radar gun frequencies. The STi is 100% electronically invisible to all RDD as they drive by your car, and from any distance they are from your vehicle. Nothing At All, Nada, No Way, Se La Vie, Go Home!