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Hands On With OnePlus' Liquid-Cooled, Light-Up Concept Phone

OnePlus debuts a concept device at Mobile World Congress in Barcelona that combines a flashy, liquid-cooled rear panel with real-world performance gains.

 & Eric Zeman Managing Editor, Consumer Electronics

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BARCELONA—OnePlus hit the ground running here at MWC with its OnePlus 11 Concept smartphone, a design study that merges the ideas of liquid cooling with high-end smartphones.

OnePlus took its OnePlus 11 5G flagship device and smushed it together with a chassis meant to reduce thermals and improve performance. OnePlus calls its Active CryoFlux technology a "game changer" when it comes to mobile cooling.

In the company's laboratory tests, the CryoFlux tech helped reduce the overall temperature of the phone by 2.1 degrees Celsius during gaming, which translates into a 3 to 4fps gain in gameplay. That's not a huge improvement, but it is something. Active CryoFlux is also able to reduce the phone's temperature by 1.6 degrees Celsius during charging, which slices 30 to 45 seconds from the overall charging time. The former metric is far more important than the latter, in this case.

OnePlus 11 Concept phone

How is it doing this? According to OnePlus, it has miniaturized the liquid-based cooling systems of gaming PCs in order to fit them into the smartphone form factor. The Active CryoFlux system relies on a piezoelectric ceramic micro pump to push the oil/silicate-based liquid through a series of pipes. The pump requires less than 0.2 square centimeters of space but is still able to circulate the liquid through the chassis without drawing too much additional power.

OnePlus 11 5G concept phone

The pipes are fitted into a glass membrane that's positioned on the rear of the phone. It is covered with a magnetron-spluttering coating wherein metal and alloy are spread about using an electric field. (Seriously, the materials team had a field day with this one.) The liquid is then illuminated on the rear panel and around the camera module to give the phone some personality. And what a personality it has.

OnePlus 11 Concept phone camera close-up

There's no denying the raw visual appeal of a phone that brings its own light-up show to the party. Granted, it's not a blinking, flashing experience like the Nothing Phone (1), but it is something other than a plain rear glass panel on what might otherwise be a boring old smartphone.

The camera module, in particular, is stunning thanks to the Guilloché etching that gives it that timepiece-like appearance.

Sadly, this is but a concept device. OnePlus says it hopes to bring a device that combines the power of the OnePlus 11 with the visually appealing cooling capabilities of this concept phone to market eventually. Until it does, we'll have to settle for this piece of eye candy.

About Our Expert

Eric Zeman

Eric Zeman

Managing Editor, Consumer Electronics

My Experience

I’m PCMag’s Managing Editor for Consumer Electronics content, overseeing an experienced team of reviewers and product testers. I’ve been covering technology for more than 25 years. Prior to PCMag, I worked at outlets such as Android Authority, Fortune, InformationWeek, and Phonescoop. 

The Technology I Use

My main tool for getting work done is a 14-inch MacBook Pro. It’s a silent and fast machine with a good keyboard and excellent battery life. When I’m not using my laptop, you can find me working (and relaxing) with an iPad Pro. I’ve come to rely on its 5G data connection when traveling, which makes it an essential part of my workflow. 

I consider myself an audiophile. That means my office and living room audio setups are total overkill, featuring advanced receivers, turntables, and Polk Audio speakers complete with subwoofers for the best possible sound, whether I’m listening to music or watching movies. My favorite earphones for private listening are the Sony WF-1000XM6.

When on the go, I typically use an iPhone 17 Pro Max for photos, but I don’t need much of an excuse to pull out my Sony mirrorless for high-resolution photography—especially when shooting sports. 

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