In case a warning chime from our Crossfires would be something you wanted on your car especially at interstate speeds to let you know your well within the expensive side of speeding you can have your CPU enabled to turn this chime on automatically. It requires the use of a DRB III. One click will activate this feature however it will only cause a chime from 75 MPH & above. Anything under that & no chime. There is no other speed choice avail. at lease not on the 2006. Our cars come from Germany with this feature deactivated. Of course we understand this is not for those who like to punch it. I know what is a Crossfire for anyway!!