I just Google around, it was called the escort dsp. It came with the digital key which was a 3.5mm headphone jack looking Keychain doohickey (technical term, don't even try) which were digital keys that are encrypted and unique to each unit. The idea was every so often the radar detector would lock itself and the only way to unlock it was to power it off, insert the unique headphone jack key thing in the port on the back, turn it on, a few seconds or a minute later the unit would come back to life. If you didn't have the key, the unit was useless. So if it got stolen, they couldn't use it and I suppose Cincinnati microwave wouldn't sell another one unless your were the one registered to that serial number?
Googling I found an article or ad from 1991, so I guess that was the time frame.
I also saw new high end radar detectors are still in the $600 price range!? [emoji23] OMG [emoji44] are you kidding me!? In the era of instant on laser radar they have the nerve to market a device like that with those kinds of prices? Wow.
And I read that most modern cars with Park assist and the ones with those radar dots in their bumpers cause false alarms and whatnot. Wow, I would have assumed radar detectors were like stand alone GPS units. Begging to be bought, I guess not.
Here's a picture I found of the smaller escort I was talking about.
I got one these somewhere... But have long since lost the digital key.