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Chinese smartphone maker Oppo has always been at the forefront when it comes to charging technology, and the company is proving it once again with a new smartphone that charges completely wirelessly.

The charging tech is not without limitations. The Oppo X 2021 smartphone, presented during the Mobile World Congress Shanghai, which kicked off on Tuesday, can charge up to 10 centimetres away from a charging mat. This is achieved with magnetic resonance tech which can deliver up to 7.5W of power to the device. No cable or charging stand is required, Oppo says.

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The phone itself is interesting, too. The Oppo X 2021 is a rollable smartphone concept that extends into a tablet-like device at the press of a button. The screen size varies from 6.7 to 7.4 inches, Oppo said, but didn't offer any other details about the device.

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Truly wireless charging tech has been around for years, but we haven't seen it implemented in a widely available smartphone. This might change soon, as Oppo's concept devices typically do trickle into the company's mass products.

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Oppo is not the only company working on this technology. Xiaomi has its own wireless charging tech called the Mi Air Charge (check out the video above). Xiaomi's technology can deliver 5W of power over distances of several metres, though it currently requires a fairly large charging station.

(责任编辑：綜合)