Key Benefits Prevents breakdowns and safety risks by alerting you to high engine temperature, low battery voltage, excessive speed, and driver fatigue. Improves in‑car visibility and reduces distraction with a bright, multi‑color 3.5‑inch HD display that makes critical data easy to read at a glance. Saves battery and offers flexible control: automatic power on/off with vehicle start/shutdown plus a manual mode when you need direct control. Main Functions Automatic and manual alarm settings for: High water (engine coolant) temperature Low voltage Driver fatigue while driving Real‑time display of vital vehicle data: Speed and configurable km/mi display Engine RPM Water (coolant) temperature System voltage Safety alarms: Low voltage alarm High water temperature alarm Overspeed alarm Fatigue driving alarm Display and Controls 3.5‑inch HD multi‑color screen for clear, at‑a‑glance information Five brightness levels with automatic and manual brightness modes Automatic on/off: HUD powers on when the vehicle starts and powers off when the vehicle shuts down to protect the car battery Manual override retained for users who prefer direct control Practical Attributes Function: Continuous monitoring and real‑time alerts for temperature, voltage, speed, RPM, and driver fatigue Size: Compact 3.5‑inch HD display for dashboard mounting without obstructing view Performance: Fast, visible alarms and selectable auto/manual behavior for both alerts and brightness Units: Easy switch between kilometers and miles Use Scenarios Daily commuting: View speed and RPM at a glance while the fatigue alarm helps remind you to take breaks on long, repetitive routes. Long trips: Automatic high water temperature and low voltage alarms help you spot overheating or battery issues early and avoid roadside breakdowns. City driving and performance checks: Overspeed alerts and RPM display help you stay within limits and monitor engine behavior during frequent stop‑and‑go traffic. Why Choose This HUD Clear, configurable alarms for the most common causes of breakdowns and unsafe driving Readable multi‑color HD screen plus flexible brightness and power settings to suit different driving conditions Keeps manual control available while offering automatic protections that conserve your vehicle battery Included Capabilities (as specified) Automatic/manual alarms for high water temperature, low voltage, and fatigue driving Multi‑color 3.5‑inch HD display Five‑stage brightness adjustment with automatic/manual modes Automatic on/off with vehicle start/shutdown and manual power mode option Displays speed, RPM, water temperature, voltage, and alarms listed above Switchable between kilometers and miles