GPS HUD Universal Speed Alarm USB Power Supply Green Font KMH MPH Switching for Cars Item Type: GPS HUD Material: ABS+PC Model: C3010 Colour: Black Function Display: Vehicle speed, GPS compass, single driving mileage, single driving time 2 Major Alarms: Speeding alarm, fatigue driving alarm Other Functions: Mile Kilometer switching, automatic photosensitive Power Supply Mode: USB power supply Satellite Positioning Speed: About 1 to 3 minutes in an open place outdoors, no satellite signal indoors (cloudy and rainy days affect the satellite positioning speed) Compass Direction: The compass direction is the driving direction of the vehicle and is not affected by geomagnetism Scope of Application: Suitable for all models