Once a flea or other bug enters one, it becomes trapped and unable to escape due to the flea traps' extreme stickiness.The flea trap is 360° unobstructed, which may draw fleas from all sides, unlike other flea traps. Flea traps can be used to catch fleas, spiders, bugs, and other pests within your home. They are prevented from escaping by sticky pads. In order to attract fleas or other insects, particularly flea pupae, to glue traps, the theory behind flea killer is to use color, heat, and light.