OBD Main Function: 1. Alarm : High water temperature / Low voltage alarm / shift reminder / over speed alarm / Fatigue driving / Engine Error 2. Multi-functions display: RPM / Voltage / driving distance /clock / water temperature / fuel consumption 3. Light sensor:HUD can automatically adjust the brightness according to the environment 4. Mileage unit:TRIP means the driving distance from engine start to off 5. Fuel consumption unit: unit of Average fuel consumption per hundred kilometers / instantaneous fuel consumption =AVG; Speed: digital display the vehicle driving speed; Speed unit: KM/H=kilometer/hour, MPH=Mile/hour GPS Main Function: 1. clock 2. battery voltage 3. altitude 4. satellite numbers 5. mileage 6. trip time. 1. Multi functions display:clock,battery voltage,altitude,satellite numbers,mileage,trip time 2. Light sensor:HUD can automatically adjust the brightness according to the environment 3. Driving direction:N-North,S-South,W-West,E-East. It display when the car is in driving. 4. Speed:display the vehicle driving speed in digital number 5. Speed unit: KM/H=kilometer/hour, MPH=Mile/hour 6. Clock and driving time 7. Mileage:display the single driving distance for this trip 8. Altitude:current altitude 9. Satellite signal :it flash for searching signal,and stop once searching the satellite signal successfully. Note: Auto-match models, plug and play According to OBD or EUOBD,(the on-board auto- diagnosis system) plug and play. Colour:As Shown Material:ABS Package Contents: 1 * Car Head Up Display 1 * NON-SLIP MAT 1 * OBD CABLE Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.