There is no credible evidence that high-frequency sound devices repel ticks, which lack the auditory anatomy to perceive them as threatening.
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Steps
schema.org/HowTo
01
DO NOT clip ultrasonic devices to belts, collars, or backpacks expecting tick protection.
02
Ticks have no ears and detect hosts primarily via heat, CO2, vibration, and odor. There is no plausible mechanism by which a tiny ultrasonic emitter would deter them.
03
The FTC has acted against multiple ultrasonic-pest-repeller marketers for unsupported claims over the years.
04
Instead, use proven, EPA-registered repellents on skin and permethrin-treated clothing.
05
Do a careful tick check on yourself, kids, and pets after outdoor time.