The Super Sonic Molechaser ® exploits this sensitivity to produce a penetrating Sonic sound of 300Hz over an area of approx. 11,250 sq. ft. (1/4 Acre) at approx. 15 second intervals. Super Sonic Molechaser ® is completely harmless to worms and other underground bugs. • Super Sonic Molechaser ® operates in a circular pattern, approx. 120 ft. in diameter. This must be an unobstructed 120 ft. Minor obstructions like lamposts are OK. • Place Super Sonic Molechaser ® at site of worst rodent infest