Flea Beacon is based on the light and heat principle. Attraction is generated by the light bulb underneath the top the flea trap. When the flies jump for this source of light and heat, they rebound into the catch tray below which is covered with a sticky strip. This sticky material traps fleas. Works best at night and can be moved from room to room for total indoor flea control. Also breaks the breeding cycle by catching adults before they have a chance to lay eggs.