1. Head-up display shows driving speed. 2. Displays driving time and mileage. 3. Over-speed alarm setting. 4. Fatigue driving alarm. 5. Altitude display. 6. Local time display with auto timezone adjustment. 7. Easy setup – Plug and play – Powered through vehicle cigarette lighter. No professional installation required. 8. Compatible with all cars and trucks. Uses GPS signal guided calculation. No wiring needed to the VSS (vehicle speed signal). 9. Display in MPH or KM/h. 10. Auto-adjusts brightness via sensor for day and night driving. 11. Green color data display, easy on the eyes. 12. Total mileage display retained after car stops. Parameters: 1. GPS positioning time: 1 to 5 minutes in open air (bad weather may affect positioning time). No GPS signal indoors. 2. Speed deviation: Since speed data comes from GPS satellite, slight deviation is unavoidable. 3. Input voltage: DC 5V. Input current: DC 50–120mA. Working temperature: -30°C to 70°C. 4. Driving data deviation is approximately 2%. 5. All driving data will be cleared when powered off, except total mileage. Color: Black Material: Plastic Package Contents: 1 x HUD Note: Light reflection and different displays may cause the color of the item in the picture to appear slightly different from the actual product. Measurement allows an error of +/- 1–3 cm.