The automotive flat-screen display shows driving data such as speed, RPM, water temperature, compass, distance traveled, etc. on the front windshield. HUD avoids the danger of drivers looking down at the dashboard. The driver uses it to view the data of driving to ensure the driver's safety and help the driver to maintain the best condition on the way. Multiple operation interface modes and colors can be switched freely, bringing you more fun and technology. D1 car head-up display has two modes - OBD and GPS mode with multiple functions. OBD mode functions: speed, RPM, voltage, water temperature, fuel consumption, compass, travel time, distance traveled, number of satellites, altitude, time, 100km acceleration time. GPS mode functions: speed, water temperature, compass, travel time, travel distance, number of satellites, time. Automatic and manual brightness adjustment mode, easier to control HUD. This car speedometer display has multiple alarm functions, including: low voltage, RPM, engine, water temperature, over speed, fatigue driving and other alarms. It allows you to know the condition of your car at any time and can save you the trouble and expense of going to an auto repair store.