Harris Bed Bug Killer Gallon with trigger sprayer kills bed bugs bed bugs and lice with a water-based formula containing Deltamethrin. The adjustable gallon trigger spray provides a stream or fan pattern. Use indoors on mattresses, box-springs, baseboards, bed furniture, living room furniture as a crack and crevice application. Product begins working after the spray dries. This formula is odorless and non-staining after dried. Always follow label directions and keep out of reach of children.