OnePlus has a new concept phone to show off, which is its way of teasing tech that maybe, just maybe, might make it into one of the company’s future phones. The OnePlus 8T Concept is a similar phone to the OnePlus 8T that was released a couple months ago, but it’s got a pretty unique rear design that changes color alongside a motion-tracking radar module.

According to OnePlus, this color-changing effect is achieved with a film that contains metal oxide, which sits underneath the phone’s glass back and changes color as different voltages are applied to it. At its most basic, it could change color to show off the phone’s notifications, like an incoming phone call, much like the notification light that it has included on its phones in the past. But where things get really interesting is when it gets paired with the concept phone’s rear-mounted radar module.

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