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Our impression of time is usually a dial divided by 12 hours,but why not make the timing button of the fan as clear as the time dial? Perhaps, we even dont need to look at the timing button, and can set the periods of time you need, even the blind can do it. You can dial 45 minutes, dial two hours, and dial to any period of time you need.
The pointer will turn back automatically, and continue to indicate the running of the time.
Chen Xiaojiao Bu Lingguo