Days before the Consumer Electronics Show (CES), OnePlus gave a glimpse of its upcoming concept phone — and its disappearing rear camera tech.

The phone, designed in partnership with carmaker McLaren, uses electrochromic glass to make the camera invisible. For the uninitiated, electrochromic glass is a type of glass that can change its tint based on power supplied to it.

A report by Wired suggests the camera has similar specifications to the OnePlus 7T Pro McLaren edition : 48-megapixel rear sensor, 16-megapixel ultra-wide sensor, and 8-megapixel telephoto sensor.

The report also outlines the design and engineering challenges in making this phone. Electrochromatic glass is quite costly and used in sunroofs of high-end cars and windows of airplanes. However, OnePlus said it won’t be mass-producing this device, so the price is not a factor.

On planes, this kind of glass takes a few seconds to go from clear to opaque or vice versa. The Chinese phone maker had to make sure this shift doesn’t take more than a second on its concept device.

Apart from the novelty factor, there’s no visible or practical use of this tech. The company will be unveiling the phone during the CES. Stay tuned to Plugged for all details.