What is an optical sensor and how does it work in earbuds?

    1. The optical sensor is an in-ear detection chip that is sensitive to light and is used by earbuds to play music.
    2. Once the earbud is inserted into the ear, light is blocked from reaching the optical sensor.
    3. This automatically prompts the earbud to keep playing music.
    4. Once the earbud is removed from the ear and light hits the optical sensor, the earbud recognizes that it is no longer in the ear.
    5. This then prompts the music playing in the earbud to stop/pause.



Also read: What is the signal-to-noise ratio and why is it important?