Precor IGR Concentrate acts on the immature life stages of the flea, preventing the adult flea from developing. Flea eggs deposited on, and larvae crawling onto treated areas won’t develop into adult fleas. Existing adult fleas and flea pupae are not affected. When applied to surfaces where fleas are found, Precor prevents adult flea emergence for up to 7 months.  Controlled Pests:  Fleas.  Does not work on ticks. Use:  Indoors, carpets, furniture, pet sleeping and bedding areas, throw rugs, and other listed areas. Active Ingredient:  Methoprene 1.2%