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. 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 mph 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: 8*5.4cm/3.15*2.13inch Package Includes: 1 Car HUD Head Up Display  1 USB Cable Note: Please allow slightly errors due to manual measurement and different monitors.