Up to 15% fuel savings, it help you save fuel.

Eco OBD-2 will recognize your vehicle and your driving habits

This item does not damage the engine and the car ECU or any other negative effects to the car setting.

It does not change any of the settings permanently, if you want to turn back to the car's settings, just pull the item out of OBD

OBD2 necessarily for cars: - Sold after January 1, 1996 in the USA - Sold after January 1, 2001 in the European Union - With diesel engine sold after January 1, 2003