"24V DC Cooling Fan" in the home more and more integral to our lives, and at the same time as people's living standards and constantly improve the technological level, household appliances now increasingly refinement in style, function, etc., and towards health, safety, versatility, energy-saving direction. Fan as a household appliance, there are also similar problems. Status quo "24V DC Cooling Fan" is now: Most only manual control, plus a timer, single function. Hazards or deficiencies exist: for example, people often leave after forgetting to turn off fans, not to mention a waste of electricity but also easily lead to a fire, long working hours are also easily damaged appliances. Another example Qianban Ye high temperature "24V DC Cooling Fan" tune higher wind speeds, but the rest of the night the temperature dropped, the wind speed does not change with temperature, easy to catch cold. The reason for the root causes of these risks are generated: the lack of detection of the environment.