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Most time, we cannot recognise whether the fan is working or not directly, especially in a dimly-lit room. So we may forget to turn it off when we leave, which results in electric energy wastage and even fire disaster. Known Fan tackles the problem as a visible reminder for the users, meanwhile, gives firsthand information about the working tap position. With the florescent material at margin of every fan blade and specifically preset rotate speeds, we can intuitively see whether it is working and which tap position it is staying in.
Shaodong Zhang； Zihao Gong; Xingsuo Liu; Yuan Tian