After poring over reviews for so many ultrasonic pest repellers, this six-pack from Avantaway had some of the best and most consistent success stories. Reviewers dealing with everything from houseflies and crickets, to water bugs and cockroaches, to lizards and mice have all had success with this set of pest repellers, which plug into your outlet to operate. These can work in spaces up to 1,800 square feet, and are super easy to use: Plug these into your outlets and wait. Within two to three weeks, the pests you’re up against should be greatly reduced.

According to one reviewer: "So easy to use with amazing results! My new neighbor brought mice with her from her old apartment. Desperate to get rid of these annoying pests, I ordered these because regular traps were not working...absolutely amazed! Literally within hours of me just plugging these into every room of the house... The mouse droppings are completely gone which means the mice are also gone! Worth every penny!”

Not only is this value pack of repellers highly effective, but it's super affordable, too. The set comes with six plug-ins, and each one features dual microchip technology that allows these repellers to reach farther. This technology also emits various frequencies to keep rodents and insects from growing immune to the device over time. Plus, each repeller covers up to 1,600 square feet, so you truly get your money's worth.

According to one reviewer: "I was really excited to try because I had problems with water bugs. I hate using sprays so I put the pest repeller in every room to stop them from crawling in my house. I haven’t seen any bugs crawling or other creepy crawling things as of today. These repellers are small and have a night light. They are easy to use you just plug them in the wall outlet no batteries, noise, or smell.”

If you’re looking for the absolute cheapest solution on this list, these ultrasonic pest repellers from Pest Soldier come in a set of four for less than $20. These work in indoor spaces up to 1,600 square feet, and work on cockroaches, mice, rats, flies, and spiders. Over 5,000 Amazon users have invested in this four-pack and given it an overall rating of 4.2 stars.

According to one reviewer: “It really did keep the German roaches and the huge black roaches away from my house and the fridge. Got to a point where I would find baby roaches with their mommas inside the fridge. I was going crazy killing and polluting my house with all kinds of chemicals and they would just hide inside the edges. But not after this amazing product! It gave me great relief and after just plugging it in four places in my house, the roaches were disappearing and [I] saw them less. Also, my fridge was cockroach-free.”

To tackle pest problems before they even reach the house, this solar-powered repeller is great for outdoor use. Here's how they work: Each repeller features a stake that you place directly into the soil or grass near your home. The solar panel on top traps in solar rays to charge the device, which releases an inaudible, high-frequency tone through the ultrasonic speakers in the device. This tone prevents rodents, skunks, squirrels, foxes, and other pets from approaching your home, and both repellers combined cover a surface area of up to 2,425 square feet.

According to one reviewer: "We were about to give up on our beautiful vegetable garden. Groundhogs and rabbits were having a feast daily without leaving a single lettuce leave for us to enjoy. My husband bought this repellent and it makes a sound the second you enter the zone. The light and noise is so unpleasant to even human ears. Those pests definitely stay sway from the garden for good. So happy, finally!”

Something that customers love about the MaxMoxie pest repeller is the fact that it goes above and beyond. Sold in a set of two plug-in units, these are great at emitting tones to help disturb pests and rodents without being bothersome to humans. The company believes that within a few weeks, pest issues should minimize with these units in place. Even better, they change the tone on occasion so that pests don’t get used to the same sound.

According to one reviewer: “Within a couple of days of using the repeller, I trapped two mice and haven't heard another in weeks. The literature with the repeller states that you must use multiple systems to get rid of mice. I used traps and the repeller. My theory is that the signal from the repeller drove the mice out of the corner and into the traps. One thing nice about the repeller is that it constantly changes the frequency of the signal so that the mice don't get used to it. I have read where mice can get accustomed to a constant signal. Would recommend it to everyone.”

If you’re dealing with unwanted pests in your car, this under-hood pest repeller is great for repelling mice and rats that can chew wiring or damage your car’s engine. This repeller emits a combination of ultrasonic sounds and LED flashing lights to deter animals from nestling under your car’s hood, particularly prevalent in the cold weather months. It also has built-in voltage protection to protect your car’s battery.

According to one reviewer: “If you have problems with rats, mice or squirrels chewing up things under the hood of your car, then I recommend getting one of these units. I’ve been using them for years, after trying nearly everything else. Don’t get the ones that run on batteries, or you will end up having to replace the batteries every 5-6 months IF YOU REMEMBER! With this type of unit, it hooks up to your car battery and you never have to worry about it again.”

While a number of the ultrasonic pest repellers on this list will repel rodents, this one by CLEANRTH is specifically designed to combat them, and works on spaces up to 7,000 square feet, far and away the best radius of any repeller on this list. Reviewers dealing with rats, mice, squirrels, and other rodents have had a lot of luck with this. And, many Amazon users particularly praise the customer service of this company, which is especially important when dealing with pest repellers, which are notoriously finicky.

According to one reviewer: “This product does what it says it will do — it gets rid of rodents! And it's incredibly easy to use. You just plug it in and leave it alone. We had a small mouse problem, but do no more. Thank you, Cleanrth!”

With 19,000 Amazon reviews and counting, this plug-in pest controller can cover up to 120 square meters (roughly 393 square feet) and features different "modes" to maximize efficiency for different pests. Like other devices, this option blasts out irritating frequencies for pests throughout your entire home. Green and blue modes are completely inaudible, while red is loud and noisy for those pests that just won't leave. On top of all that, it repels just about any and every pest you can imagine, including rodents, bedbugs, mosquitos, spiders, and cockroaches.

According to one reviewer: “I first bought these gadgets in black and put one in the garage and one in the unfinished basement. Both areas were crawling with spiders and insects. After about a week or two I notice a considerable decline in the amount of insects I saw in both areas. There were less spider webs, less mosquitoes, and other insects. My wife was so impressed we bought 2 more for indoors (white), one on the main floor and one in our bedroom, she hates the sight of anything crawling.”

These mini ultrasonic repellers are perfect if you're looking to get rid of rodents, specifically. The high-frequency tone these emit is effective at ridding your home of rodents, while also doubling as a soothing night light. Each repeller in this pack of six features a small, blue ring that isn't overpowering. Plug them into your bathroom, kitchen, or hallway in place of a regular old night light. One note: Because these repellers are so small (and are only equipped to handle 400 square feet apiece), Amazon reviewers suggest using a few in larger spaces.

According to one reviewer: "We use these to make the critters leave their hiding spots and run in a particular direction toward humane traps. We don't keep them plugged in, but use them in sequence. Plugging in one after the other to corral the wee beasties. So far so good!”