iRULU A8 Head Up Display OBD2 or EUOBD Car Speed HUD Plug & Play - 5.5" Color Screen 1. iRULU car speed warning HUD: apply for cars in line with A8 OBD II or EUOBD (onboard automatic diagnostic system), plug and play, super easy installation just set all parameter and plug it in then turn your engine ON. 2. HD 5.5" multi-color large screen: automatic and manual brightness adjustment mode, easy for drivers to get the driving data without requiring drivers to look away from their usual viewpoints, more security. 3. HUD Alerts you if you exceed the speed limit by setting Over-speed buzzing alarm. 4. 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. 5. More driving information from Head-Up Display: vehicle 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 KM/h MPH.