Car Digital GPS Speedometer HUD Head up Display Electronics Speed Alarm Vehicle Speed Compass Speed Gauge Plug and Play Gadgets For All Cars MPH KMH

OverviewPlease Note: This device is a GPS digital speedometer. The speed is collected by satellite. Therefore, if you test it at home or in a parking lot, it may not display the speed correctly. Please test it in an outdoor car with good signal. Installation: 1. Before installing, please drive your car outside, not in the garage or indoors, and then open your car window; 2. Please connect the USB cable to your car's USB port, connect the other end of the cable to your device; 3. Stick it on the dashboard, start your car, it will take about 1-3 minutes to search for the signal ( Please Note: The sensor must face the windscreen of the car and can't be hidden). 4. When "0" appears, the installation is complete. How to adjust the speed error? -Long Press the button to enter into the setting interface; -Adjust the number to "4" by moving up/down the button, and then press the button to save. -The default speed is 100, you can adjust the number to change the speed. For example, If the speed error is above 3, it can be set to 97. If the speed error is below 3, it can be set to 103. How to adjust the speed unit from KM/H to MPH? -Long-press the button, enter into the setting interface. -Adjust the number to "1" by rolling up the button. -Short-press the button, enter into the speed unit interface. -Adjust the speed unit to MPH by rolling up the button. -Short press the button to save it. How to adjust the speed limit? -Long-press the button, enter into the setting interface. -Adjust the number to "2" by rolling up the button. -Short-press the button, enter into the speed limit interface. -Adjust the speed limit as you like by rolling up the button; -Short press the button to save it.