[HUD Description] GPS digital speedometer H3, the speed be displayed in digital form on the screen, so that your driving process more and security, feel the new experience of technology. The -up display allows you to focus on driving. Avoid looking down at your car's instruments for greater . [Function Display]Improve driving , project the compass, real-time speed, real-time time, speed warning, fatigue driving, this driving time, this driving mileage, total mileage, public mileage switching and other information to the front of your vision. [Reminder function]The car speedometer gps has a speeding alarm function and fatigue driving function. Reminds you when you're travelling long distances. [Plug-and-Play]connect the USB interface, connect the satellite signal can display the car digital speedometer, easy to operate, plug and play, not afraid of car power loss, no drilling, not picking models, what car can be used. Colour:Black Material:Plastic Package Contents: 1x Car Gps Speedometer Set 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.