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:
1. The signal is line-of-sight only. It does not pass through walls, around corners, or under furniture — so it covers maybe 8–10% of a typical room. 2. 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 →