Dreo Smart TurboPoly 765S review: What do you get for the money? “Natural” varies the fan speed to give you the impression of a natural breeze. 4 / 9And finally, “Sleep” dims all the lighting and silences any beeps, while steadily reducing the fan speed as you doze. But if you want to do it, the Smart TurboPoly 765S makes it easy. If getting maximum airflow exactly where you need it is your main priority, the Smart TurboPoly 765S is in a class of its own.