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If you want to go out in haze, you usually have to consider about your safety because the driver cannot see you clearly. Your breath becomes your safety guard with this mask. When you expire, the temperature increases. The chips on both sides of the mask will flash. When you inhale, the temperature restores to normal. The light will turn dim thereafter. The light is guaranteed to be seen at least 500 meters away which will remind drivers to watch out. Of course this mask can be used in other kinds of weather.
Xueqing Yu Xiangnan Song Bao Gao