Apple's True Tone technology debuted in 2016 with the 9.7-inch iPad Pro and later became available on newer ones
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Recall that True Tone technology usesone or more light sensors for constant access to brightness and color temperature. Measurements are transferred to the operating system, and it adjusts the white balance on the display for them, reducing eye strain.
As a result, the screen color of your MacBook Pro always matches the temperature of the room's lighting, and the eye strain becomes less.
Already managed to find out that the multi-channel light sensor is located next to the built-in FaceTime HD camera.
Apple says True Tone technology isn’tuses a FaceTime HD camera, however, the laptop cover must be fully open so that the function can work even if you have an external display connected.
Light sensor in previous MacBook Pro modelscould only measure brightness, but not color temperature, so True Tone technology will not appear on older laptops with software updates. The True Tone feature works with external LG UltraFine 4K and UltraFine 5K displays, as well as the Thunderbolt display along with the Thunderbolt 3-Thunderbolt 2 adapter.