Many providers advertise low monthly rates, but the "true cost" includes several one-time and recurring fees:
Not all devices are created equal. When comparing brands like Smart Start , Intoxalock , or LifeSafer , keep these factors in mind: I Need to Install a Discreet Interlock Device - Smart Start
Don't forget the final $50 to $100 to have the device taken out once you're finished. 3. Look for These Key Features