Height adjustment: Adjust the tailgate to the appropriate height, press and hold the tailgate button for 5 seconds, and hear a long beep that indicates the height setting is successful. Speed adjustment: The tailgate switch speed is divided into 5 gears, the default is 4 gears, the lowest 2 gears, and the highest 6 gears. Press and hold the tailgate button. When the buzzer sounds 2 consecutive sounds, it means that the speed setting 2 is successful. When the buzzer is heard for 3 consecutive sounds, the speed setting 3 is successful, and so on.