Spectre IV RDD, Spectre 4 RADAR DETECTOR DETECTOR Spectre IV can't detect the Bel STi Driver Radar Detector Spectre IV can't detect the Bel STi-R radar detector remote Spectre IV can't detect the Escort Passport 9500ci radar detector remote Spectre IV closeup view. The Spectre 4 attaches to the windshield using suction cups. But it can't detect the Bel STi Driver or the Bel STi-R Remote radar detectors.

The new Spectre IV and IV+ radar detector detectors (RDD) have improved local oscillator detection sensitivity, which enables police to detect noisy radar detectors at greater distances. The Spectre IV+ has a unique control allowing the operator to better locate radar detectors in commercial vehicles in states and provinces where radar detectors are legal for private vehicles.

The Spectre IV and IV+ locate radar detectors by detecting the electromagnetic (RF) "leakage" from the local oscillator frequency of the radar detector. Some manufacturers try to screen out the leakage with shielding; others try to adjust the leakage to a frequency that the Spectre isn't sensitive to. So far, most radar detector manufacturers have failed and their products are easily detected by the Spectre IV; except for the Beltronics STi Driver, Bel STi-R remote radar detector and the Passport 9500ci remote radar detector.

While the Spectre 4 RDD is pretty darn good, it isn't good enough to detect the stealth radar detectors from Beltronics and Escort Passport.