Easy to use: Plug and Play digital car speedometer. Works immediately after power-on. No other operations required. Beautiful design: Square and round digital car speedometer. Simple screen design. Innovative universal HUD (Head-Up Display) screen for car with built-in sunshade. It can also be seen clearly in sunlight. Precautions: The digital car speedometer is a GPS-enabled digital speedometer. The speed is tracked via satellite. When testing at home or in a parking lot, the speed may be displayed incorrectly. You can test it outside your car with a good signal. Principle of operation: The digital car speedometer is suitable for all car models. No compatibility issues. The speedometer display has large fonts that are easily visible day and night. Wide range of applications: The digital car speedometer has a wide range of applications and is suitable for all cars, trucks, buses, electric scooters, bicycles, and motorcycles.