Ortho Home Defense Max Flying Insect Trap Refills are an easy-to-use solution to get rid of pesky gnats, fruit flies, and house flies in your home. When used inside your Ortho Home Defense Max Flying Insect Trap, sold separately, these glue traps capture and hold pesky flying insects, providing 24/7 protection. Use fly traps anywhere inside your home where flying insects are a problem, including kitchens, food areas, bathrooms, basements, storage areas, and near houseplants or fruit. To use, unplug your insect trap to remove the old glue trap cartridge inside your insect trap. Replace with a new refill cartridge, and plug your insect trap back into the wall. Just like that, your trap is ready to catch more flying pests. Review and follow all label directions when replacing glue traps. When the glue trap is full, replace it with a new trap. This package comes with 3 glue trap refill cartridges for 3 months of protection.