HD Projection with Zero Ghosting - 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. OBD+GPS Dual Mode - M20 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. Multiple Alarm Functions - 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. Compatible Attention - OBD2 mode is only available for most vehicles manufactured after 2008. GPS mode Perfect Suitable for All Vehicle. ( If your car is not compatible with OBD mode, please toggle the scroll wheel button to the left or right to switch to GPS mode within 5 seconds after the HUD is turned on.)Dual System, Change free. OBD2 mode is not compatible with hybrid electric vehicle, diesel car, pickup truck, RV, computer modified car, it is recommended to use the GPS mode.