Soft start: the speed of compressor increases gradually from low to high, with low   starting current and power.

     Allow user to easily operate the unit.

     Used to automatically stop or start vertical louver movement and set the desired   left/right airflow direction.

     Reduces the compressor’s starting current and includes built-in mechanisms to   protect the compressor in unusual scenarios.

     Used to store setting when a power failure occurs.

     Used to decrease energy use while you sleep.