Built for the home the exterminator couldn't fix.
Petzly was created because the pest control industry had a dirty secret — and too many families were paying the price for it.
She found a mouse the same week her youngest started crawling.
The exterminator quoted $1,400. The family — including the dog — had to leave for four hours while he treated. She paid. The problem came back six weeks later.
She tried Raid. Then she Googled what Raid does to a crawling baby's hands. She tried snap traps. She found one with a still-live mouse in it. She tried a cheap ultrasonic device from Amazon. Nothing.
Then she found a University of Arizona study: commercially available ultrasonic devices weren't working because they used a single fixed frequency — one that pest nervous systems habituate to within days. The same way a person stops noticing a hum in a room, rodents stop responding to a monotone signal.
She went looking for a device built around rotating multi-frequency technology instead. It didn't exist. So she built it. That device became Petzly.
Backed by 22 years of pest behavior research.
Dr. Anne Mitchell, PhD, spent over two decades studying how pest nervous systems respond to environmental stimuli — including ultrasonic frequency. She was among the first researchers to identify the habituation problem with single-frequency devices.
When Petzly's founder approached her with the dual-wave variable frequency concept, Dr. Mitchell immediately recognized it as the correct application of the science. She joined as Scientific Advisor and helped refine the frequency rotation parameters that make Petzly categorically different from every other device in the category.
"The science has always supported ultrasound as a pest deterrent. What the industry got wrong was the delivery. Variable frequency isn't a marketing claim — it's the mechanism that makes the science actually work."
One device per room. Your entire home, covered.
Because ultrasonic waves don't pass through solid walls, each Petzly unit is designed to protect a single room of up to 300 sq ft — the size of a standard bedroom, kitchen, or living area.
Most customers start with three: one for the kitchen, one for the bedroom, and one for wherever the problem is worst. From there, the coverage is complete — and continuous.
No maintenance. No refills. No appointments. Just plug it in and leave it running.
The cheap ones fail for a specific, fixable reason.
The FTC didn't warn that ultrasound doesn't work. They warned that single-frequency devices don't work. Petzly was built around that distinction.
The Habituation Problem
Single-frequency devices emit a fixed tone. Pest nervous systems adapt to it within days — the same way you stop noticing a ticking clock. The device becomes background noise.
Dual-Wave Variable Frequency
Petzly continuously rotates through the 25–65 kHz range. Because the frequency never repeats on a fixed pattern, pests cannot acclimate — the discomfort never becomes background noise.
Zero Compromise on Safety
No chemicals. No residue on floors or surfaces. Silent and odorless to humans, dogs, and cats. Safe in kitchens, nurseries, and pet areas with no need to vacate.
"Your home should feel like yours. Not like a problem you're managing."
That's the belief Petzly was built on. Not to sell devices — to end the cycle of ineffective treatments, recurring exterminator costs, and the quiet shame of a pest problem that won't go away.
Four things we will never compromise on.
Honesty about the science
We tell you exactly what the research says — including what doesn't work and why. You deserve to understand the mechanism, not just take our word for it.
No chemicals. Ever.
Every member of the Petzly team has children or pets. We built the product we needed — one that protects the home without creating a second hazard inside it.
A guarantee that actually means something
90 days. Full refund. No questions, no return shipping cost, no hoops. If Petzly doesn't work in your home, we don't want your money.
One purchase. Permanent protection.
We don't sell subscriptions. We don't profit from repeat infestations. We make one device that works continuously for as long as it's plugged in.
Try it in your home for 90 days. If it doesn't work, you pay nothing.
Over 50,000 families have made the switch from chemicals and exterminators to Petzly. The guarantee exists because we know it works — and because you've been let down before, and you shouldn't have to take that risk again.
Shop Petzly — Risk Free →