Keep an eye on your speed without looking down. Instantly see when youre driving too fast. Keep it safe. Avoid speed violations. Speedometer, RPM, engine temperature, voltage, and more! Install it yourself in minutes. Just find the OBD-2 port and connect the scanner (included). Features: 1. Automatic sensitivity: automatically adjust brightness and darkness 2. Engine speed (RPM) display 3. Single driving distance (M/KM) display 4. Water temperature (°C/°F) display 5. 0-10km acceleration time display 6. Clock display 7. Single driving time display 8. Voltage display 9. Fuel consumption display (L/100KM fuel consumption per hundred kilometers/L/H instantaneous fuel consumption) 10. Alarm function: (overspeed alarm, speed alarm, water temperature alarm, voltage alarm, fatigue driving reminder) Product introduction HUD short for head up display. It displays driving datas on the front windshield such as speed,water temperature,voltage,single mileage etc; to avoid drivers unsafety because of watching the instrument while driving.Drivers can read the driving information instantly , and can always keep the best state on the way with HUD. Package Included: 1 x Car Portable Speed Monitor