What the research actually says
Independent academic studies have repeatedly tested ultrasonic devices against control groups and against active rodent populations. Conclusions:
- Kansas State University (Department of Entomology): "Ultrasonic devices have minimal, if any, impact on pest behavior. Any reduction is temporary and pests resume normal activity within 3–7 days."
- EPA review (2001): The agency required several ultrasonic-device manufacturers to remove unsupported efficacy claims from packaging.
- Auburn University Cooperative Extension: Documented field tests showing no significant difference in rodent capture rates with vs without ultrasonic devices active.
Why pests acclimate
Ultrasonic devices work on the premise that mice/roaches find the frequency disorienting. Two problems:
- The signal is line-of-sight only. It does not pass through walls, around corners, or under furniture, so most of a room — including every place a mouse actually travels — is in acoustic shadow.
- Pests habituate. After 2–7 days, mice will literally build nests adjacent to active ultrasonic devices. Roaches have been observed crawling across them.
What actually works
If you want to spend $20 on pest control, spend it on:
- A tube of NP1 silicone caulk
- A roll of copper mesh (Stuf-fit)
- A pack of T-Rex snap traps
Seal the gaps + place a few traps. That'll outperform a $200 ultrasonic setup every time.
For anything beyond a few stragglers, professional exclusion + bait protocols are what work. Free inspection →