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# enabledExposureSignals

Can be assigned to control which characteristics AE should use in its decision making, must be a subset of supportedExposureSignals.

```
var enabledExposureSignals: Set<AVCaptureDeviceExposureSignal> { get set }
```

## Discussion

When `automaticallyEnablesExposureSignals` is true, the system may automatically change the enabled signals based on other enabled device properties. When `automaticallyEnablesExposureSignals` is false, you may assign a custom set of exposure signals to this property. This property is key-value observable.

> Throws: `NSInvalidArgumentException` if assigned while `automaticallyEnablesExposureSignals` is true

> Throws: `NSGenericException` if assigned without first obtaining exclusive access to the receiver using ``doc://com.apple.avfoundation/documentation/AVFoundation/AVCaptureDevice/lockForConfiguration()``.

---

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