Description: 【Plug and Play】: Car hud head up display work directly after connecting the power supply without any other operation. And the HUD switches on/off when you start/stop the engine. 【Accurate Speed 】: No jump speed, the display is very coherent and smooth. Ensure timely and accurate car speed and display. 【User-Friendly Display Screen】: Car HUD Head up display with to shield the screen from the sunlight, and the large font shows the key data clearly day and night. 【Speed Unit】: Available in km/h and mp h versions; This device Is A digital speedometer, and the speed is collected from. Therefore, if the test is conducted at home or in the parking lot, the speed may not be displayed correctly. Please test outside the car with good signal. 【Widely Used】: Hud head up display speedometer Powered by a 5V USB power supply, can work on all cars/trucks/buses/EVs, and more. Size Chart: 92*52*20mm/3.62*2.05*0.79inch Package Includes: 1pcs Car HUD Head Up Display  1pcs USB Cable 1pcs Mat 1pcs Cover Note: Please allow slightly errors due to manual measurement and different monitors.