What does the hotel use to repel mosquitoes in summer?

At present, most hotels, KTV, shopping malls, bars, fine arts institutes, clothing stores, 4S stores, sales centers, high-end office buildings and families will introduce fragrance systems (fragrance extenders), which can not only remove all kinds of odors, but also make people feel happy, clear-headed, improve work efficiency, enhance corporate image and leave a deep impression on guests.