Specifications: Name: Car GPS HUD Material: LED+ABS LED Light Color: Green Power Supply Method: USB Power Supply Input Signal: GPS Speed Unit Type: Km/H,Mph Compatible With: All Car Models Features: -- Works directly after connecting the power supply without any other operations. --No jump speed, the display is more consistent and smooth. --The speed is very accurate and the speed refreshes quickly without any delay. --The product is small in size and can be displayed in full screen without taking up more installation space. --Clearly visible day and night. - KM/H and MPH versions available. Note- This device is a GPS digital speedometer, the speed is collected from satellites. So if you test it at home or in a parking lot, the speed may not be displayed correctly. Please conduct the test in a place with good signal outside the car; Package includes: 1 X Car GPS HUD 1 X Non-slip Dashboard Mat 1 X USB Cable 1 X User Manual