1. 5.5 inch color large screen head up display - Plug and play with OBD II or EU OBD connectors for most cars - Compatibility notes: it can work with gasoline cars produced after 2004 in some regions, and cars produced after 2008 in other regions. Dodge, Jeep, Mazda, Suzuki, and all French and Italian cars may not work on some Kia and Hyundai models. Please refer to the compatibility list for full details 2. What is hud and what data does it show - The hud projects driving data onto the front windshield to keep your eyes on the road - Displays key information such as speed, RPM, water temperature, voltage, and distance traveled - Helps reduce the risk of looking down at the dash by providing data in your line of sight - Features multiple working interfaces to suit different driving needs and preferences 3. Simple screen design and windshield integration - The head up display mirrors driving data onto the windshield - To minimize ghosting from the double layer of glass, a reflective film is included for easy mounting on the windshield - Supports automatic and manual brightness adjustment - Uses nano-technology to reduce unwanted reflections and make the screen information clearer 4. Practical functions and safety features - Overspeed reminder to alert you when you exceed the preset speed limit - Multiple alarm options and display interfaces to suit different scenarios - Automatic power on and off with vehicle start/stop, helping protect the car battery - Manual switch mode option for flexible HUD control - Designed to provide convenient access to driving data without distracting the driver 2-3 use scenarios - Daily city commuting: glance at speed, RPM, and temperature data on the windshield while keeping your focus on the road - Long highway trips: monitor engine data and trip distance without looking away from traffic, with automatic brightness for comfortable visibility - Fleet or multi-vehicle use: quickly compare essential driving metrics across vehicles and manage overspeed alerts to improve safety and efficiency Included in the package - 5.5 inch color head up display unit - OBD II or EU OBD connector compatibility - Reflective windshield film for glare reduction - Auto and manual brightness adjustment options - Manual switch mode for HUD control - Overspeed alerts and vehicle start/stop integration features