1. Windshield HeadUp Display: Unlike conventional car headup displays, this system uses the car's windshield as a projection screen to directly display data. The large font presents the most critical speedometer information in realtime, offering simplicity and clarity. Additionally, the headup display minimally obstructs the driver's line of sight, ensuring both convenience and safety. 2. MultiFunction Speedometer: Beyond showing current speed, this headup display can also project RPM, mileage, water temperature, time, voltage, and more, making it versatile. The MAIMEIMI headup display features 16 data display modes. Equipped with an OBD system, the digital speedometer provides realtime and accurate data feedback. 3. 5 Alarm Functions: This digital car speedometer includes multiple alarm features, such as speeding alert, fatigue driving alert, RPM alert, water temperature alert, and voltage alert. If any of these values exceed preset thresholds while driving, the headup display will emit a warning sound. 4. Automatic Brightness: The car headup display has a builtin light sensor that detects ambient brightness and automatically adjusts its display intensity, ensuring clear visibility of projected data day or night. You can also manually adjust the brightness by referring to the user manual. 5. Easy Installation: This car speedometer is compatible with most fuelpowered and hybrid vehicles equipped with an OBD2/EUOBD interface, enabling plugandplay installation. (Note: This HUD speedometer is only suitable for OBDII and EOBDcompliant vehicles and is not compatible with cars manufactured before 2008.) If the displayed speed does not match your vehicle's dashboard reading, you can finetune it using the instructions in the user manual.