Smartphones have special eyes that can see you even in the dark. These eyes are called infrared sensors, and they help your phone know when you’re looking at it, just like how you can tell someone is watching you without speaking.
Examples
- Your phone turns on automatically when you pick it up, like it can see your hand.
- Even in a dark room, your phone knows you're looking at it because of its special eyes.
- You don’t have to press any buttons, the phone just knows.
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See also
- How Do Touchscreens Know Where You Tap?
- Why Do Smartphones Use So Much Battery When You're Just Looking at Them?
- How Can a Tiny Chip Hold All Your Data?
- How Can You See Through Walls?
- How Can a Single Phone Know Where You Are?