Company Website: http://www.spectre-rdd.com
In the US, the Spectre RDD is sold by Stalker Radar
The Spectre RDD is a Radar Detector Detector (RDD for short), which is used by police to catch motorists using radar detectors in areas where radar detector use is prohibited by law.
Modern radar detectors are superhetrodyne receivers, which utilize an internally-generated signal called a local oscillator. Some of this signal "leaks" from the radar detectors. The Spectre receives this signal, and alerts the officer.