| 摘要 |
A device which repels rodents by generating sound waves at a frequency offensive to rats and mice. The sound waves are generated by coils that are alternately energized and deenergized by a solid state control circuit. The circuitry includes two timing circuits which establish a three minute operating cycle during which the coils are energized at the desired 60 cycle per minute frequency for two minutes and are inactive for one minute. The sound waves are transmitted through the ground line of the electrical wiring system of a building, directly through the ground for control of below ground rodents, or through the building itself in the case of a wall mounted unit.
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