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The taxi industry is very popular in the world travel industry, so the taxi driver's work is also very hard.As a result, the driver experienced fatigue driving.This product is a fatigue reminder, which can help to remind the driver,If the driver is tired, the alarm will make a loud noise to remind him，However, if the driver is tired several times within a certain period of time, the alarm will release irritant gas to remind the driver, so as to protect the safety of the driver and passengers.