How to select Waterproof Cooling Fan?

Summer arrived, "Waterproof Cooling Fan" on the market also began selling them. Although, with the improvement of people's living standards, people are generally fitted with air conditioning, but practical and convenient "Waterproof Cooling Fan" in our home life is still essential. Now fans of the market, more and more brands and styles, faced with an array, a wide variety of "Waterproof Cooling Fan" products, when we buy what issues should pay attention to? The former is simple structure, easy operation, low price for its features, generally having to change the wind speed and the two functions; the latter to complex functions, features luxury beautiful shape.