Safe, Effective & Non-Toxic. The flea trap works by killing adult fleas looking for a pet to infest. The light, heat and infrared rays from the light bulb are strong attractants for fleas. The fleas jump up to the trap, fall through the screen and are killed on the sticky pad. Each flea caught prevents 200 more fleas from infesting your home. Works without pesticides or toxic chemicals. This is a permanent, economical and attractive way to reduce fleas.