A8 5.5 inch Car OBDII HUD Warning System Vehicle-mounted Head Up Display Projector with LED, Support Fuel Consumption & Over Speed Alarm & Water Temperature & Fault Diagnosis Introduction This product is for drivers' safety, at high speeds, especially in high-speed driving at night, in order to avoid the driver to look down their head to watch the instrument, and decrease car accident. HUD is in extremely critical moment reflects its delicate care. HUD can project the important information displayed by the instrument (such as speed) onto the windshield, it can not only to help determine the speed of inexperienced novice to control their speed and avoid many of the speed limit road due to speeding violation. More importantly, it enables the driver instantly read the number in great vision and always make drivers eyes on the road in clear mind. 1. HUD can display many useful information, and allows you to experience the speed and also to ensure your driving safety and driving pleasure. 2. HUD uses the latest stable performance of integrated circuits design, the indexes are in line with the standards, unique and elegant shape, smooth lines, thin body natural beauty, for your car to add a beauty. 3. Before you use our HUD, please read the instructions in detail, in order to make full use of all the features of the HUD. Features 1. Automatic adaptation car models, and can apply for cars in line with OBD II or EUOBD (onboard automatic diagnostic system). Plug and Play. 2. 5.5 inch large screen and high-definition display. 3. Multi-color design makes the screen more abundant and easier to read 4. The use of nano-technology to eliminate unwanted reflections and can make display information more sharper. 5. New function:driving mileage measurement 6. 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