A Valentine One is a radar detector. It has (as an option) a remote display, so you can have the unit in your window and the LEDs out of sight.
One option on the Pontiac Grand Prix is an HUD or "Heads Up Display". This projects various readings such as speed and stuff on your windsheild as a "ghost" image, so you can tell how fast you're going without looking down.
What he has done is SOMEHOW connected his radar detector to this HUD. Hence my comment, 2KWK4U is a GOD.