First Response Bed Bug Trap is a permanent trap appliance to provide long term monitoring for bed bugs. It is intended for use to confirm that a treatment has been successful or to detect a fresh infestation. The trap works with a combination of heat, carbon dioxide and an advanced pheromone lure to attract bed bugs. The bed bugs sneak under the cover and fall through the grid to get caught on the sticky pad inside. Allow 2 weeks after any bed bug treatment before placing Bed Bug Traps, as residuals from treatment may affect catches.