If anyone can explain of what practical use this little gizmo is,I'd be intrigued.
I had it for three years in my A4 and could find little practical use for it at all.
You set it,it beeps,you look at the speedo and slow down,you let your speed creep up again,it beeps,you slow down etc.etc.etc.
A constant cycle of beeping,and looking at the speedo.
You're as well just keeping an eye on the speedo in the first place !