"220V AC Cooling Fan" can sense the temperature of the environment, in order to adjust the fan speed to achieve a better work results. The user can choose this intelligent speed mode, you can also choose to manually set the mode to control the speed. When you select the manual mode is set, the function does not play a role. A variety of security features: When "220V AC Cooling Fan" is tilted beyond a certain level, the motor will stop work in order to ensure safety; when the fan motor temperature exceeds the allowable temperature, in order to ensure the safe use, the motor will also stop working. When there is an object close to or in contact with "220V AC Cooling Fan" shield, the motor will stop running.