P19 Car HUD Head-up Display GPS Speed Meter Car OBD2 Fault Elimination Code 1. This product connects car OBD2 interface by OBD cable, and display the driving dates, e.g. vehicle speed, engine RPM, water temperature, fuel consumption,voltage etc. It can keep the driver's eyes always on road to avoid the dangerous of lowering down head to read the dashboard. This product won not change any car ECU dates. 2. OBD mode display information: vehicle speed, water temperature, voltage, fuel consumption, speed, single mileage, total mileage accumulation, travel time, time, oil temperature, air-fuel ratio, turbine pressure, intake pressure, acceleration test, brake test, read data stream Alarm: overspeed alarm, speed alarm, high water temperature alarm, low voltage alarm, engine failure alarm, clear fault code 3. GPS mode Display information: vehicle speed, driving time, satellite time, altitude, number of satellites, driving direction, single mileage, voltage, acceleration test, brake test Alarm: overspeed alarm, low voltage alarm 4. Features: High-definition display screen, multiple UIs can switch different screens, and the digital color of the interface can be adjusted freely 5. OBD mode working voltage: 11V~18VDC (12Vdc200mA), when voltage is higher than 24V, please use a USB cable for GPS mode.