This is the cheapest I've seen the Vornado 633DC of this model and is more energy efficient than the standard 633 model (which is priced cheaper but more expensive to run).
This is an room air circulator and its role is to push/circulate air in a small-medium sized room unlike a directional conventional fan (like the Kmart/Kogans) which blows directly at you.
This is great for pushing AC cooled air into other areas/to other rooms of your house.
Better get the 660 model at Costco for $158 (or thereabouts) if you have membership.