1. Automatic alarm function The up display of the model has a speeding alarm function. When the vehicle speed exceeds the preset maximum driving speed (standard 120 km/h), the device beeps. You can set a speeding alarm value in advance, and when the car exceeds the set speed value, a beep will sound. 2. Automatic light sensitivity The up display can automatically adjust the brightness of the light sensitivity, the scorching sun is clear and soft. This is a carefully developed automatic detection of ambient light based on the principle of the photoelectric effect of a professional HUD manufacturer. It is clearly visible during the day and not afraid of being dazzled at night. 3. What is H4 HUD H4 is a brand, improved version of the up display, the first color version, with eyecatching colors, a brand interface design, larger fonts, clearer and smoother graphics, very beautiful, and provides people with a dreamy visual experience. 4. H4 function display The up display has multiple functions that can be ly switched. For example: vehicle speed, ambient lighting, number of satellites, automatic light sensitivity, speeding alarm, odometer switching, etc. You can clearly see your driving speed, time, and direction while driving, and many functions of this up display can ensure your driving .