Harris Bed Bug Killer 32oz Spray uses an odorless and non-staining formula that continues to kill after the spray has been applied. This item is registered with EPA No. 3-11 and is approved for indoor use in apartments and residences. Harris Bed Bug Killer is part of an integrated pest management treatment process. It should not be the only product used to kill bed bugs. Diatomaceous Earth bed bug killer should also be used as part of the treatment process.