The advanced technology of the Lentek Mosquito Contro emits a choice of three frequencies to help control mosquitoes. Two of the frequencies match the wing speed of the male mosquito, which female mosquitoes (the only mosquito which bites) instantly stay clear of. The other set frequency is the sound of the mosquitoes natural enemy: the dragon fly. All three frequencies are barely audible to the human ear and can be adjusted for desired coverage up to a 20 x 20 area. Safe for kids and pets, the non-toxic Lentek Mosquito Contro will have you bite-free all summer long.