An auto insurance company is promoting a new device as a way to lower your rates, but one privacy watchdog is worried about what else it could bring.

Desjardins Insurance is offering a telemetric device similar to an airplane's black box to drivers in Ontario and Quebec, pledging that it could save drivers hundreds of dollars a year by making sure they're practicing safe driving habits.

However, one privacy watchdog said he's concerned about what other uses they could have for the data, including in court.

The CBC's Simon Gardner shares more details in the above video.