These traps work overnight to detect and monitor all stages of bed bugs. The traps have a CO² lure, a heat source and a pheromone lure; essentially they mimic a person and attract bed bugs into the trap. Bed bugs are invasive and are being found any place that people go; hotels, houses, apartments, condominiums, airplanes and even department stores and libraries. Use these traps to check for them overnight, and keep your peace of mind.