Sourcingbay 5.5" Large Screen Auto Car HUD Head Up Display KM/h & MPH Speeding Warning With OBD2 Interface Automatic and manual brightness adjustment mode, driving without glare. 5.5'' large screen and high-definition display. Multi-color design makes the screen more abundant and easier to read. The use of nano-technology to eliminate unwanted reflections and can make display information more sharper. New function:driving mileage measurement.