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Finally, Apple Watch has an ambient light sensor under the glass, which samples the environmental light falling on the screen and then automatically adjusts the brightness up or down to improve viewing comfort (so it’s not too dim or too bright, based on where you are). An ambient light sensor also helps to regulate the power that the display uses, thus squeezing more battery life out of the watch.

In fact, with Apple Watch Series 5, the Retina screen is always on — just dimmed — until you turn it towards your face to read the time or other info. In previous Apple Watch models, the screen goes to black when you’re not looking at it, and takes a split second to wake up and turn on when you turn it towards you.