2019 car head up display hud a8 5.5 inch auto hud display hud a8 obd2 interface speed alarm multi-color ing

feature: rich contents: speed, water temperature, voltage, instantaneous fuel consumption, average fuel consumption, driving distance measurement. alarm functions: shift reminding, speed alarm, fatigue driving reminding, low voltage alarm, high temperature alarm, engine fault alarm, fault code elimination. easy to use: just plug and play, hud can automatically adapt to vehicle type which in line with obdii.