There are many concept gadgets that exist as demo videos and never really see the light of day. OnePlus doesn̵
OnePlus has refined the color-changing glass hardware that was in the previous concept device for the 8T Concept. This time, it’s spread across the back of the device (which seems like it shares most of its other hardware with the OP 8T that went on sale a few months ago). The wavy patterns on the back of the case change color from broken silver to blue, driven by an electric current controlled by the phone’s hardware.
Like the previous concept, this application is almost completely stylish. Technically it could be used to display notifications or call alerts, but its on / off nature seems to limit its usefulness. But the 8T Concept also includes a “radar sensor” embedded in the camera module, which emits and detects mmWaves similar to 5G frequencies (which do not interfere with wireless performance). This can be used for gesture control, a la Google’s now-abandoned Soli technology, or even to detect breathing.
The Concept One’s sleek camera case and leather body have failed to make it into a retail product, and it seems unlikely that the 8T Concept’s color-changing panels will. But OnePlus doesn’t seem ready to let go of its ECMF (Electronic Color, Material, and Finish) development. We may see it implemented somehow in the coming years, especially if OnePlus feels it needs a hook to compete with emerging folding designs.
Source: OnePlus forum