KKmoon Universal Car HUD Head Up Display KM/h & MPH Speeding Warning Windshield Project System Automatic adaptation car models, and can apply for cars in line with OBD II or EUOBD (onboard automatic diagnostic system). Plug and Play. 3" screen and high-definition display. Multi-color design makes the screen more abundant and easier to read. The use of nano-technology to eliminate unwanted reflections and can make display information more sharper. Display rich content: speed, engine speed, water temperature, battery voltage, low voltage alarm, high temperature alarm, speed alarm, free switching between kilometer and mile,free switching between  and .