Features: *1. Widely Used: Powered by a 5V USB power supply, can work on all cars/trucks/buses/EVs, and more. *2. Plug and Play: Work directly after connecting the power supply without any other operation. And the HUD switches on/off when you start/stop the engine. *3. Accurate Speed Monitoring: No jump speed. GPS+Beidou dual chips ensure timely and accurate car speed monitoring and display. *4. User-Friendly Display Screen: With a hood to shield the screen from the sunlight, and the large font shows the key data clearly day and night. *5. Speed Unit: Available in km/h and mph versions; This device is a GPS digital speedometer, and the speed is collected from satellites. Therecompatible for e, 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. Package Includes: 1 x HUD 1 x USB Cable 1 x Anti-slip Pad 1 x User's Manual