This is a 3-Layer Defense System from Green-Strike that prevents, kills and zaps mosquitoes. This innovative system is the latest in backyard mosquito control, with each layer providing a specific barrier of defense. Layer 1, the Mosquito Preventer, works to reduce the mosquito population by trapping mosquito eggs. Layer 2, Electra 1800 Zapper, protects your party zone by immediately zapping and killing mosquitos and flying insects. Layer 3 is the LED Zapping Bulb that stops mosquitos as a last defense.