Harris Home Pest Control Bed Bug Killer liquid gallon uses an effective odorless formula. This item is approved for indoor use in apartments and residences. Additionally, it features an extended trigger sprayer for easy application. Always read and follow label direction before use.We recommend using this product in combination with our bed bug aerosol egg kill on mattresses, box springs, walls, floors and carpets and following up with diatomaceous earth bed bug powder behind electrical outlets and around switches where bed bugs tend to congregate. The odorless, non-staining formula kills bed bugs after the spray dries.