This article is made of choice materials, superior in quality, effective in respelling mosquitoes (驱蚊), with sanitary (卫生的) effects, harmless to human beings and livestock (家畜). Each coil (一盘) burns for eight hours. You are welcome to use this Tiger Brand anti=mosquito incense coil (蚊香). Directions for use: 1) Push the center of the metal holder upwards; 2) Fasten the center of coil to metal holder; 3) Light the end of coil.