Features: 1.Can display vehicle speed, water temperature, voltage, fuel consumption, rotational speed, single mileage, total mileage accumulation, driving time, driving direction, search quantity, altitude, system time, intake pressure, oil temperature, air?fuel ratio, turbine pressure, intake Air pressure, acceleration test, brake test, clear fault code, read data stream. 2.With overspeed alarm, high water temperature alarm, low pressure alarm, variable speed alarm, speed alarm and other functions. 3.Large color screen display, clear display of reflective reading, more convenient and practical. 4.It can reduce the possibility of traffic accidents and improve your driving safety. 5.Package contains a whole set accessories, which can provide much convenience for your using. Specification: Item Type: Auto OBD2 + GPS Systerm HUD Material: ABS+PC Color: Black Fitment: Fit for Vehicles complying with OBD II standards Instructions: 1. The OBD cable can be connected to the OBD interface of the car, if the OBD mode is not compatible, please switch to the GPS mode. 2. Connect the USB cable to the cigarette lighter interface (This mode can only be used in GPS mode) 3. Navigation Method: Need to download WiiYii APP software, HUD and smart phone for Bluetooth wireless connection, and display navigation information synchronously through APP OBD Mode Function: Car speed, water temperature, voltage, fuel consumption, speed, single mileage, total mileage, cumulative driving time, number of stars, number of stars, altitude, system time, intake pressure, oil temperature, air-fuel ratio, turbo pressure, intake pressure, acceleration test, brake test, clear fault code, read data stream Alarm Function: Overspeed alarm, rotational speed alarm, high water temperature alarm, low voltage alarm, engine failure alarm GPS Mode Function: Vehicle speed, driving time, satellite time, altitude, number of satellites, driving direction, single mileage, voltage, acceleration test, brake test.Product can not automatically shut down how to solve? You can enter the Settings, select the sleep voltage, and adjust it a little higher. Note: Please allow 1?3mm difference due to manual measurement. If the product can not automatically shut down, you can enter the setting item, select the sleep voltage, and adjust it a little higher.