I didn’t actually buy the ultrasonic pest repellent for myself at first. It was one of those late-night Amazon orders my wife made after spotting a little mouse in the pantry. I’ll be honest—I rolled my eyes. We’ve tried all kinds of things before: peppermint sprays, snap traps, even those sticky pads that I hated throwing away. So when she showed me a four-pack of these little plug-ins, I figured it was just going to be another gadget collecting dust in the junk drawer.
The first one I plugged in was in the kitchen, and I remember thinking it looked more like a nightlight than some kind of “pest defense system.” It even had that faint blue glow that made the corner of the room look almost like a fish tank. I had to unplug the toaster to make space for it, which annoyed me more than I’d like to admit. For a couple of nights, nothing really changed. If anything, I swear I saw more ants crawling near the back door. My wife said that’s how these things work—drives them out of hiding before they disappear. I wasn’t convinced.

Here’s where it got weird. I came downstairs one morning and realized I hadn’t heard the scratching in the walls for a few days. Normally at night, I’d hear faint rustling behind the pantry, and even though it never got to the point of infestation, it gave me that unsettled feeling. But suddenly, silence. My wife noticed it too. Even our dog, who usually sits and stares at the corner like he’s watching a ghost, stopped doing it. He did tilt his head the first night the plug-in was running, but after that he just ignored it.
The real test came when I forgot to keep one plugged in. We had moved the unit out of the guest room because my brother was staying over, and I just left it sitting on the counter. A week later, he mentioned seeing a cockroach skitter across the bathroom floor at night. Maybe coincidence, maybe not, but I plugged it back in, and we didn’t see another. That’s when I started thinking maybe these little gadgets weren’t snake oil after all.
What I Liked
- Simple and Clean: It’s super easy to use—just plug it in. Plus, there are no chemicals, no smell, and no messy traps to deal with.
- Peace and Quiet: It works silently, so it doesn’t bother me or my family. The only ones who hear it are the pests it’s meant to repel.
- Safe for the Family: I don’t have to worry about the kids or the dog getting into traps or sprays.
What Could Be Better
- Patience is Key: It’s not an instant fix. You have to give it a week or two for the pests to get irritated and leave.
- Needs to Stay On: It only works when it’s running. As soon as you unplug it, the pests can come right back.

Of course, not everything about them is perfect. For starters, you have to give up an outlet, and in older houses like mine where outlets are already in awkward spots, that’s a bit of a headache. I had to shuffle things around in the living room just so I could plug it in without blocking the lamp. And sometimes, the faint glow actually bugged me when I was trying to keep the room dark—though my kid loved it because it doubled as a nightlight in her room. She even called it the “bug zapper light,” even though it doesn’t zap anything.
Another thing I noticed is, you can’t just rely on these as a miracle cure. If you’ve got crumbs on the counter or dog food left in the bowl overnight, pests will still find their way. I had one embarrassing moment where my neighbor asked if it really worked, and while I wanted to say yes confidently, I also admitted we’d gotten better at keeping things clean, so it wasn’t just the device doing the heavy lifting.
But here’s what made me stick with it: peace of mind. There’s something oddly comforting about knowing I don’t have to set traps anymore or come across a dead mouse in the morning. It’s not the kind of thing you brag about, but when you’ve got kids and pets, not having to worry about poisons or snap traps lying around is a relief. One less stress in the house.
Funny enough, the one I keep in the garage has probably done the most noticeable job. We used to get these fat spiders nesting in the corners. I’m not saying they’ve disappeared completely, but when I went to get the lawnmower out last week, there were way fewer webs than usual. Maybe it’s coincidence, maybe not, but I’ll take it. My son joked that the garage feels “less haunted” now, which is exactly how I’d describe it too.
What I’ve learned is you sort of forget they’re even there after a while. They hum quietly (not something I can hear, but I guess pests can), and they just blend into the wall. Every once in a while, I’ll notice the glow in the corner and remember, “Oh right, that thing’s been running nonstop for months.” And for the price—ours was something like $30 for a four-pack—it feels like a pretty low-stakes gamble that paid off.
If you’re expecting an instant miracle, you’ll probably be disappointed. The first week or two, I thought it was doing nothing at all, and I almost unplugged it for good. But after living with it for a while, I can honestly say our kitchen feels calmer, cleaner, and definitely less like a late-night critter party.
And maybe this sounds silly, but the biggest win is that my wife hasn’t brought home another mouse trap since. For me, that’s worth the glowing corner and the lost toaster outlet. Sometimes it’s the small, quiet fixes that make the house feel more like home.