The monitoring device -- sort of like a black box for cars -- tells Progressive what time people drive, how many miles they've driven, how fast they accelerate and how often they hit the brakes. It does not track where people go.
Under Progressive's program, customers can earn a first-term discount of up to 10 percent just for signing up. When they renew their policy, their rate could decrease by up to 60 percent based on their driving habits. But it could also increase by up to 9 percent.
