1. No display on the screen, no power Check whether USB line is damaged, replace USB line test, and prohibit using voltage higher than 5V 2.No speed The satellite icon flashes indicating the star search state. Please move the car to the open road and wait until the satellite icon stops flashing 3.The speed is not allowed Check unit correct, km KM / mile MPH, (speed unit switch reference settings) When the car leaves the factory, the manufacturer increases the speed displayed on the dashboard by 5-7%, and the international standard is subject to satellite data Fine-tune the vehicle speed, if the meter displays 100 Km/h, the machine displays 105 Km/h, and adjust the parameter value to 102 4. Driving direction is wrong The satellite can't tell your direction when there have no speed, and the speed exceeds 5KM / H 5. The speed is still displayed after the car is stopped Underground parking lot, tunnel, overpass, with shielding will make the signal unstable satellite drift, please drive the car to the open road 6.Turn off the buzzer The wheel dials left for 2 seconds to turn off the buzzer and dial left again to open the buzzer