Head Up Display ,5.5" Car Hud A8 with OBD2 Interface Plug Play Vehicle Speed, Engine Speed, Water Temperature, Driving Mileage Warning Automatic adaptation car models,and can apply for cars in line with OBD II or EUOBD (onboard automatic diagnostic system).Plug and Play 5.5" large screen and high-definition display;Multi-color design makes the screen more abundant and easier to read New function:driving mileage measurement;The use of nano-technology to eliminate unwanted reflections and can make display information more sharper Automatic and manual brightness adjustment mode,driving without glare;Auto power on and off with vehicle started and shutdown,effective protection of the car battery; while retaining the manual switch mode,and more beneficial to control HUD Display rich content: speed,engine speed,water temperature,battery voltage,instantaneous fuel consumption,average fuel consumption,mileage measurement,shift reminding,fatigue driving reminding,low voltage alarm,high temperature alarm,speed alarm,engine fault alarm,fault code elimination,free switching between kilometer and mile