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# headphoneAudioExposureEvent

A category sample type that records exposure to potentially damaging sounds from headphones.

```
static let headphoneAudioExposureEvent: HKCategoryTypeIdentifier
```

## Discussion

iPhone and Apple Watch save a [`headphoneAudioExposureEvent`](/documentation/HealthKit/HKCategoryTypeIdentifier/headphoneAudioExposureEvent) sample when the device generates a notification about loud headphone audio. Both devices generate these notifications when the user listens to audio long enough and at a volume that could affect their hearing. In some regions, users can enable or disable loud headphone notifications from Settings > Sounds & Haptics > Headphone Safety.

Samples of this type use values from the [`HKCategoryValueHeadphoneAudioExposureEvent`](/documentation/HealthKit/HKCategoryValueHeadphoneAudioExposureEvent) enumeration.

## Topics

### Metadata Keys

[`HKMetadataKeyAudioExposureLevel`](/documentation/HealthKit/HKMetadataKeyAudioExposureLevel)

The audio level associated with an audio event.

[`HKMetadataKeyAudioExposureDuration`](/documentation/HealthKit/HKMetadataKeyAudioExposureDuration)

The audio exposure event’s duration.


---

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