Plug and Play: The device powers on with the vehicle ignition and powers off when the engine is turned off for seamless use. 2 in 1 Smart Car Safety System: GPS HUD and Vehicle Inclinometer combine hands navigation with tilt monitoring to support safer driving. Speed Unit: KM/H and MPH switch , so you can choose the units that match your region. Easy installation: Uses the included car charging cable; compatible with all vehicles and requires no extra tools. Why you need it: Keeps navigation information in your line of sight with the HUD, reduces the need to look down at the dash, and provides tilt awareness to help on uneven surfaces. Practical benefits: Simplifies cross country driving with adjustable speed units; enhances awareness of vehicle attitude on slopes or inclines. Use scenarios Daily city driving: The GPS HUD projects turn by turn directions onto the windshield, allowing you to keep eyes on the road while following navigation. Parking on slopes or ramps: The inclinometer provides tilt information to help you gauge angle and alignment when parking on inclines. International or mixed unit travel: Switch between KM/H and MPH as needed to match local speed limit conventions during trips.