Harris Pyrethroid Resistant Bed Bug Killer is the most effective bed bug killer offered from the Harris product line. Throughout the United States, pockets of pyrethroid-resistant bed bugs exist that are resistant to traditional chemicals used in other products. Harris Black Label kills bed bugs of all types (and their eggs) quickly and provides lasting protection for 16 weeks. The formula is odorless and non-staining. This product is registered with the Environmental Protection Agency (No. 1021-2597-3) for use in homes with people and pets.There are small pockets of pyrethroid resistant strains of bed bugs in located in some cities in the US. For those strains, tough pyrethroid resistant insecticides are needed to effectively eliminate the bed bug colony. We recommend using this product in combination with our bed bug aerosol and diatomaceous earth powder.