5.5 inch car HUD projector head-up display OBD II This is a device that directly projects important data onto the windshield directly in front of the driver's line of sight, so as to achieve continuous road perception. feature: Automatically adapt to car models, plug and play in line with OBD II or EUOBD (Automatic Auto Diagnosis System) models. Vehicle speed, engine speed, water temperature (voltage/throttle position/ignition advance angle/100km acceleration), fuel consumption, mileage, low fuel reminder, rest reminder, engine failure, are displayed simultaneously. The normal display mode, high-speed display mode, and automatic display mode can be selected. The kilometer and mileage can be switched freely, which greatly facilitates the meter of the British car. 5.5 inch display area, more conducive to data readingSwitching stations, launch vehicles, and trucks are shut down to effectively protect the cars battery; at the same time, keeping the manual switch mode is more conducive to controlling the HUD. The speed single-level four-alarm mode is more conducive to driving safety. Speeding alarm is helpful for timely shifting, and it also has special meaning to save novices. Automatic and manual brightness adjustment mode, not dazzling. Specification: Ambient temperature: -40C~ 80cAir pressure: 86-106KPaRelative humidity 10%~95%Environmental noise