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This tiny device keeps mosquitoes away all summer, and it's only $20 during Prime Day

When it comes to having a mosquito-free space, there aren't too many products that will help keep these insects at bay for long. While you can use citronella candles as a deterrent, those often produce a chemical-like smell that isn't necessarily pleasant after hours of use.

As you're beginning to prep your outdoor spaces, there's one tiny gadget that keeps popping up on Instagram that might help repel mosquitoes for good (or at least while you're trying to enjoy the outdoors throughout the summer). Thermacell's Patio Mosquito Repeller is Amazon's No. 1 bestseller when it comes to mosquito-repelling devices, thanks to its small size but powerful technology. It helps keep bugs away for up to 12 hours in areas that are up to 15 square feet.

Unlike citronella candles, Thermacell's device is scent-free. Plus, according to its product description, it's six times more effective than 42 citronella candles.

Thermacell Patio Shield Mosquito Repeller, $19.72 (Orig. $26.50)

$19.72 $26.50 at Amazon

When you purchase the Thermacell patio repeller, the cordless device includes everything you need to have it set up in minutes, including three repellent mats and one small fuel cartridge that lasts 12 hours. And when your device runs out, you can easily buy new replacement mats and cartridges.

Once you install using the simple instructions below, the fuel provides enough heat to warm the mat that spreads the deet-free repellent. There are no scents, flames or spray involved.

Because the device is cordless, you can easily transport it between different seating areas — it's not confined to just one space.

With more than 40,000 reviews and counting, this is the mosquito-repellent device you never knew you needed. One reviewer even said that it "worked so well, I thought my blood chemistry had changed."

"It doesn't make noise, doesn't [produce] a smell and doesn't take up any room. Most everyone who visited purchased one. I advise you do the same if you're a mosquito magnet like me. It really is a game-changer," the customer continued.

While most purchasers are satisfied, some said the device didn't start working fast enough for their liking. It's also worth noting that because the repeller contains butane, you can't return it if you're not satisfied, as one reviewer said. However, they were still able to get a full refund from Amazon.

If you're prone to mosquito bites, you'll try just about anything to be able to enjoy a summer night without bites, which is why this should definitely be your next Amazon purchase.

And in case you need repellent mat refills and extra fuel cartridges, those are available to buy in bulk below.

Thermacell Mosquito Repellent Refills, $27.63 for a 72-hour pack (Orig. $29.99)

$27.63 $29.99 at Amazon

If you liked this story, shop these editor-approved Amazon deals.

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