One night last week, I was waking up from cold at midnight. I started to cough. It lasted one and half days, I did not pay attention until I felt a fever at work. Luckily, they were gone in 10 minutes after I used 3 pieces of Ai Facemasks insert (1 piece in every 3 minutes without evaporating ethanol). I was asked to do the COVID-19 test. The negative result came out on February 3rd. This is the third example, use it without evaporating ethanol. The first one was a friend who had a similar experience with me. Because of this miraculous effect, she then bought a lot to give to the local government department. The second was at a gathering of more than 100 people, and one person had a particularly bad cough and couldn't stop it. After I evaporated the alcohol completely, I gave her one piece. She stopped coughing for about 20 minutes. Then she coughed again. I gave her another one without evaporating ethanol. She soon became completely normal. If it is not such a special case, do not use it this way. Because alcohol is irritating. can irritate the eyes. The only one who asked to return the product after receiving it, he has asthma and said the product irritated him to cough. After we returned the money, he said he spent a night evaporating the alcohol and decided not to return it (replace the order).