Technology 5 min read

Hands-on: This 25W MagSafe charger is thinner than an iPhone: KUXIU K4 Air [Video]

By The Best News Network November 15, 2026

When it comes to 3-in-1 travel chargers, I look at two main things: How fast it can charge my iPhone and how portable it is. I have tested plenty of travel chargers that aim to be as portable as possible by using lightweight materials or folding into a smaller footprint, but there usually seems to be some sort of compromise. But this new K4 Air by Kuxiu might be the most impressive option I’ve tested to date. This charger is just 8.5mm thin, weighs less than 120 g, and can wirelessly charge your iPhone at up to 25W. After spending a few weeks with it and traveling across the Atlantic, here is what you should know about the Kuxiu K4 Air.

Be sure to check out our hands-on video with the K4 Air to see it in action!

Kuxiu K4 Air specs and features

The biggest selling point of the new Kuxiu K4 Air is its design. When completely folded, this thing is barely thicker than an iPhone. For reference, my iPhone 17 Pro measures roughly 8.25mm thick, while the K4 Air comes in at just 8.5mm. That is insanely compact for something that can charge three devices at once. And even though they went ultra-slim, they did not really need to sacrifice any charging performance. You get:

Supports Qi2.2 25W wireless magnetic charging
Secondary charging pad that supports up to 15W charging
Apple Watch charger up to 5W
CNC-machined aluminum
Doubles as a stand that allows for portrait and landscape viewing
Includes cable, travel pouch, and 45W charging brick in the packaging

One of my favorite things about Kuxiu has always been their price-to-performance ratio. While some brands and companies are removing charging bricks and even cables, Kuxiu is adding a ton of value here by including everything you need directly in the packaging. The build quality of the charger is also fantastic. It feels balanced, well-made, and extremely versatile because of all the situations you can use it in.

Kuxiu has also done a great job of bringing us a Burgundy color option that perfectly matches the new Burgundy iPhone color. I wish Apple would continue making the Cosmic Orange iPhone because the K4 Air in that orange would have been awesome.

My experience

I recommend watching our video to see my reaction when I pick up the K4 Air for the first time. I was shocked at how small it was. It was thin and lightweight, but still felt solid because it was made of metal and not plastic. The form factor and size make it incredibly easy to throw into any bag, pocket, purse, or even just leave it attached to your iPhone for when it is needed.

The charging experience is actually pretty straightforward. You unfold the charger, connect the USB-C cable, and you’re ready to go. The main magnetic charging surface supports your iPhone, while the second surface is for AirPods. They even added magnets to the AirPods charging pad to ensure they stay in place every single time. There is also a dedicated Apple Watch charger that folds down to charge any Apple Watch. I was charging my Apple Watch Ultra 4, and it fit perfectly.

But now the big question: how well does it work with the iPhone Duo? Personally, I charge my iPhone Duo on my nightstand charger when it is folded shut. So I have zero issues with it. But if you open the iPhone, place it on the charger in landscape mode, and then use it, it will tilt slightly to the left. But to my surprise, if you use the iPhone Duo and open it in portrait mode, it works great! The charger doubles as a stand and easily supports the iPhone Duo. Another cool piece that the form factor unlocks is that it can technically charge two iPhones at the same time, so if you are in a pinch, you can charge two iPhones at once,

So, regardless of which iPhone you are using, as long as it supports MagSafe, you are good to go. But how much does something like this cost?

Pricing and availability

The Kuxiu K4 Air is finally back in stock after a limited initial run. You can get it on Kuxiu’s website for $79. It comes in Space Gray and their new Burgundy color. As I mentioned above, you also get the charging cable, a 45W charging brick, and a carrying pouch.

Personally, I am a huge fan of how good the Burgundy color looks.

Final thoughts

After using the Kuxiu K4 Air, it is just one of those accessories that makes sense. It is small, compact, lightweight, and extremely useful. It fits perfectly into the travel charger category. There are a ton of great 3-in-1 chargers, with new ones flooding the market daily, but very few combine this level of portability with all the features we discussed.

So if you are shopping for a portable 3-in-1 travel charger for yourself or as a gift, I would highly recommend giving this one a shot. It’s well-built, charges your big three Apple products, and looks fantastic.