This program produces sound in the range of 16000Hz to 20000Hz which is beyond the audiable range of humans pests and other animals can though hear the same. this sound produces an undesirable effect on mosquitos and other pests thus restrains them from flying.nge of humans pests and other animals can though hear the same. this sound produces an undesirable effect on mosquitos and other pests thus restrains them from flying. DO NOT LET BUGS RUIN YOUR TIME , DOWNLOAD THIS.