4pcsGasoline Vehicle Auto Optimization ECO OBD2 Power Fuel Boost, Green

Up to 15% fuel saving, it can help you save fuel. Eco OBD-2 will recognize your vehicle and driving habits after driving about 200km/150 miles, so Eco OBD-2 will fit your car perfectly to save more fuel. This item will not damage the car's engine and ECU or any other negative effect on tuning car. It will not change any settings permanently. If you want to return to the car's original settings, just remove the item from the OBD-2 connector. Easy to install, plug and play. Note: the data are manual measurement, please allow 1-33cm error, due to differences between light and screen, there will be a certain color difference, the specific received in kind prevail.