The special designed black light tube (ultra-violet rays) is completely harmless to human bodies and pets.Outer mesh protects human from touching the grids.No chemicals involved in it, no fumes, no smell, no sprays, no mess, and pollution free.The insect killer series are ideal for indoor use, such as houses, factories, food shops, butcher storage, hospitals, garden, farms etc.Product Description:The Crownline Insect killer is used to attract the flying insects by black light, such as flies, moths, mosquitoes, and other flying insects, and then electrically chraged, high voltage metal grids will electricute the insects.