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This HUD applies high-performance processing chip to ensure the smooth operation at high speed and nanotechnology to eliminate double reflection. It starts automatically when the car starts and shuts down automatically after the car turns off, no need to manually operate that is convenient and energy efficient. The HUD can display vehicle Speed KM/H MPH, Water temperature, Voltage, engine speed, in addition, it also has three alarm functions including overspeed alarm, high temperature alarm, low voltage alarm.