Usage Tips:Features:1. Plug & Play: After connecting to the power supply, car HUD head up display can work directly without any other operations. No skip speed, more coherent and smooth display. 2. Innovative Design: Self equipped sunshade hat, even in the sun smart digital speed meter can also receive praise. And large font, clearly visible during the day and night. 3. Note: This device is a GPS digital speedometer, and the speed is collected from satellites. So if you test at home or a parking lot, perhaps the speed cannot be displayed correctly. Please conduct the test outside the vehicle with good signal. 4. Widely Used: Built-in GPS chip, car HUD head up display is suitable for all cars, buses, trucks, bicycles, scooters. Material: ABS+PC colour: Black Package Contents: 1 x GPS Speedometer 1 x USB Cable 1 x English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.