?【HUD 3D】WHY HUD? My car dashobard has speed.「When driving speed at 60MPH, head down for 1 second, like a blind to drive 16.67miles. 」This is a latest high definition LCD TFT HUD of 3D reflection display,no need paste the film on car windshield as normal HUD, it can project and display the data on its own display directly. A normal HUD always has double image under direct sunshine, therefore this HD mirror HUD can display without any double image.?【HUD GPS】it's a universal digital speedometer GPS HUD, collecting driving speed time and all other info from GPS satellites, USB cable connect the HUD to car usb port or car adaptor(some old cars don't have usb port, then just connect it to a car adaptor), so it can work on all vehicle include electric-car, diesel car, hybrid car, LPG, truck, SUV, ATV, pick-up and so on. USB install, no damage to your car computer!?【HUD Display】this HUD can display vehicle driving speed, real time clock, trip driving distance, trip driving time, GPS signal and altitude. 6 kinds of interfaces: speed, speed+clock, speed+trip distance, speed + trip time, speed + altitude, speed+satellites quantity. Default speed unit is MPH, can be switch to KM/H also.?【HUD Alarms】Fatigue driving alarm and over-speed alarm. Over speeding alarm include 1 level speed alarm or 4 level speed alarm 60-100-120-180, each value can be on/off according to your need. Freely drive between country and city.?【Hud - 2021 New】 First time usage, pls take off the screen protection films on both sides. 2 years quality warranty, if the HUD can't work as your expectations, pls contact with me anytime.