effective help for a speeder

This is a good unit. It took me a little while to get used to the different tones or pitches the alerts use for the various bands, but its very helpful. I drive in a familiar area, where the false alarms are common to me and I know when to ignore alerts and when not to. I will tell you, I have been saved many many times with this little machine.
As far as the unit itself, it has volume control and the display can be dimmed so as not to be so obvious in the dark. It has auto mode or can set it to highway or in town. I just use auto.
I'm sure this has paid for itself tenfold - with all my savings on tickets! (Now if i could just stop getting tickets for not stopping all the way...:-)