I did use the cigarette lighter. I'm pretty sure mine only had two wires coming into and and we just tested for polarity and tapped right in. I'm wondering if your year has something different going on. Google didn't help?
the blue display on the RD isn't enough to grab my attention. It sits just below my rear view mirror, and if the entire screen flashed, I could probably notice (not as easily as this tho) but I use the advanced display so the screen only changes a few pixels when it starts going off. You'd have to be staring at it to notice (not good while driving
The main reason is when it goes off, the quicker I can react the less likely I'm going to get a ticket, so I made this as obnoxious as possible without being too annoying ha. The alert over music would be nice too, unless you were listening to a quiet audio source and had the volume cranked.. Ouch!