These are technically "high-frequency" rather than ultrasonic (which begins at 20kHz). Younger humans with sensitive hearing may find these frequencies highly irritating or even painful.
The track cycles through 15,000Hz, 17,500Hz, and 20,000Hz .
While the theory suggests these sounds create an "unbearable" environment for pests, real-world results are often underwhelming:
Electronic Rodent Repellent | Ultrasonic Mouse Repellent - Orkin