Harris Roach Killer 1 Gallon Trigger Spray is ready to use for indoor and outdoor use. This water based Deltamethrin formula is non-staining and odorless after the product dries. Shake container well before spraying in or around: kitchens, bathrooms, basements, buildings, foundations, around windowsills, patios, decks, or doorways to kill cockroaches. After the spray dries, the formula is odorless and begins working. The adjustable trigger sprayer allows for both a streaming spray and broadcast fan pattern. Keeps killing German cockroaches for up to 18 months on porus surfaces. Always follow label directions and keep out of reach of children.