For Cars Triple Over-Speed Alarm Auto Light Sensor KM/H MPH Switchable Voltage 5V W2 White Reflective HUD Digital Speedometer

W2 White Reflective HUD Digital Speedometer For Cars Triple Over-Speed Alarm Auto Light Sensor KM/H MPH Switchable Voltage ≤5VFAQ1.The screen has no display and there is no power.Check if the USB cable is damaged or replace new one for testing.（It is forbidden to use a voltage higher than 5V or change the installation line）2.No speed displayAfter the product is powered on, please move the car to an open road to receive the signal,need waiting for searching the signal,When '- - - ' shows 0, it means the signal is connected and can be used normally.3.The speed is still displayed after the car stopsWhen driving in underground parking lots. tunnels. under overpasses and other places where the signal is unstable, the data displayed by the product may have deviation. Driving the car to an open road and wait a moment will restore to normal.4. Inaccurate vehicle speeda.Please check if the speed unit is correct kilometer KM/H or Mile MPH(Refer to the setting item speed unit switch)b.If the speed unit is correct, fine-tune the speed, the car displays 100Km/H, the HUD product displays 105Km/H, and the HUD parameter value can be adjusted to 102Km/H.Package Included:W2 Head-up Display (white screen) *1Note:1.The color of the actual items may slightly different from the listing images due to different computer screen, thanks for your understanding.2.No installation guides are included, we highly recommend to seek professional installation.3.Any damage during installation will not be refunded.4.All dimension are measured by hand, Please allow 0.5-1 inch difference due to manual measurement.5.In the extreme strong light environment such as noon in summer and clear Wan Li, the display contrast of all projection HUDs will naturally weaken due to the excessive ambient light, which is a common physical optical phenomenon. To ensure round-the-clock availability,We recommend that you:Brightness can be adjusted: the product is equipped with multi-gear brightness level function, please manually adjust it to a higher gear under strong light.