How about the mosquito-repellent incense of chrysanthemum? Can someone tell me?

Grandfather's generation is buying mosquito-repellent incense made of elemene. The small one can be used for 7-8 hours, and the big one can be used for 8-9 hours. Sleeping at night is just right. This mosquito-repellent incense has no irritating smell, is mild, smoke-free and dust-free. Personally, I think it is particularly easy to use.