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 for speed calculation. No wiring to VSS (vehicle speed sensor) needed. 9. Display in MPH or KM/h. 10. Automatically adjusts brightness via sensor for day and night driving. 11. Green color display, easy on the eyes. 12. Shows total mileage after the car stops. Parameters: 1. GPS positioning time: 1 to 5 minutes in open air (weather conditions may affect positioning time). No GPS signal indoors. 2. Speed deviation: Since speed data is derived from GPS satellite, slight deviation is normal. 3. Input voltage: DC 5V. Input current: DC 50120mA. Operating temperature: -30C to 70C. 4. Driving data deviation is approximately 2%. 5. All driving data is cleared when powered off, except total mileage. Color: Black Material: Plastic Package Contents: 1 x HUD Only the above items included; other items not included. Note: Light reflection and differences in display screens may cause slight variations in color between the product image and the actual item. Measurement error allowance: +/- 13 cm.