What should I do firstly when I receive the product?

Because the air does not circulate during storage and transportation, in order to achieve the best performance of the device, it needs to be placed in the outdoor ventilation for at least 6 hours before the first use.Meanwhile, each sensor has individual differences, just like everyone is with different alcohol metabolic ability, so a small number of sensors may require longer ventilation. In this situation,to extend the ventilation time will be advised. If the reading is still not normal, please feel free to contact customer service for further processing.