Usage Tips:And EcoOBD2 finds out the hidden power of your car.Up to 15% fuel saving ECOOB2 chip tuning is very easy to use Plug ECO OBD2 chip tuning into OBD2 connector of your car.And turn the ignition on for 30 seconds.And Turn the engine on ECOOBD2 chip tuning settings are optimal and the best for your car.Even the parameters are different for each vehicle, there might not be a need to make an additional adjustment ECOOBD2 chip tuning will recognize your vehicle and your driving habits after around 200 km/150 miles driving, and then Nitro chip tuning adjusts itself to match your car perfectly Packageinclude:1x Car Fuel Saver Note: 1. Due to the different monitor and lighting effect, the actual color of the item may be slightly different from the color shown on the pictures.2. Please allow 1-3cm error due to manual measurement.(1 inch = 2.54 cm) Thanks for your support :)