The Flowtron Fly Sex Lure is the X-Factor of the Indoor Bug Zapper and Fly Killer series of products. When used along with the UV Bulb, it helps increase the effectiveness of the Bug Zappers and Fly Killers and keeps you and your family safe from flies and other insects. Each slow-release lure lasts for up to 30 days. This Fly Sex Lure is compatible with the following models: FC-4400, FC-4800, FC-4700, FC-4900, FC-7600, FC-7800, FC-8800.