MAIMEIMI windshield HUD - Projection on the windshield: uses the windshield as a projection screen to display the most important speedometer data in large, clear font. Real-time information stays visible without blocking your line of sight, supporting safer and more convenient driving. - Multi-function speedometer: in addition to current speed, it can display RPM, mileage, water temperature, time, and voltage. It offers 16 data display modes, which you can switch to focus on the most useful data for your drive. Digital speed with OBD provides more real-time, accurate feedback. - 5 alarm functions: includes speeding, fatigue driving, RPM, water temperature, and voltage alarms. If a value exceeds preset limits, the HUD will beep. Alarm values can be set to your personal preferences or legal requirements for safer driving. - Automatic brightness: built-in light sensor adjusts display brightness automatically for day and night visibility. Manual brightness adjustment is also available according to the user manual. - Easy to install: compatible with most fuel and hybrid cars that have an OBD2/EUOBD interface. Plug and play installation. Note: this HUD is for OBDII and EOBD vehicles only and is not suitable for cars manufactured before 2008. If the speed reading does not match your instrument cluster, refer to the user manual to fine-tune the speed display. Use scenarios - Long highway drives: monitor speed, RPM, mileage, and real-time OBD data for optimal performance and safety. - Urban commuting: rely on alarms to prevent speeding and fatigue, with clear data at a glance. - Night driving: automatic brightness adjustment ensures readable projections without glare.