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Hall Effect Sensor

A sensor that can detect a magnetic field.

In phones, its most common use is detecting the proximity of a magnet embedded in an attached accessory, such as a flip cover or VR goggles.

For example, with a flip cover, a small magnet embedded in the flip cover is positioned so that it aligns with — and triggers — the Hall Effect sensor when the cover is closed. When the sensor is triggered by the magnet, the screen shuts off or switches to a special idle mode.

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