15000hz, 17500hz & 20000hz Ultrasonic Ultimate Extreme Mouse And Rat Repellent (11 1 2 Hours) Instant

The track cycles through 15,000Hz, 17,500Hz, and 20,000Hz .

This is the threshold of ultrasound, generally inaudible to most adults but well within the hearing range of mice and rats.

The audio includes a "ticking" sound every second as the frequencies switch, which is intended to prevent rodents from habituating (getting used) to a single tone.