Uses a semi-transparent, semi-reflective lens to display information stereoscopically in the air. Unlike windshield project film, you can always see the clear, crisp image on the display board, never ghosting/double image. GPS Mode Information Display: Speed, travel time, satellite time, altitude, number of satellites, running direction, single mileage, voltage, acceleration test, brake test. Alarm: Overspeed alarm, low voltage alarm, free switching between kilometer and miles. Auto and manual brightness adjustment mode, driving without. With auto on/off function, HUD will start or turn off automatically with vehicle ignition, can effectively protect your battery vehicle. Retain manual switch mode, easier to control HUD. Multi-function display: Speed, Speed + Clock, Speed + Single Driving Distance, Speed + Altitude, Speed + Satellite Number, Speed + Single Driving Time. Can be freely switched.