These environmentally-friendly traps are filled with a powder made from exploded egg shells. The bugs crawl in and quickly dehydrate; preventing them from returning to the outside world. Place a trap in each problem window to break the cycle. Each trap holds thousands of bugs and lasts up to 2 – 4 years. Attaches inconspicuously to windows with a sticky strip (included). Safe and clean, with a lower cost than toxic sprays, and they really work!