---
title: attenuationDurations
framework: exposurenotification
role: symbol
role_heading: Instance Property
path: exposurenotification/enexposuredetectionsummary/attenuationdurations
---

# attenuationDurations

An array of durations at specific radio signal attenuations.

## Declaration

```swift
var attenuationDurations: [NSNumber] { get }
```

## Discussion

Discussion important: This property is available in iOS 12.5, and in iOS 13.5 and later. An array that contains the duration, in seconds, at certain attenuations, using an aggregated maximum exposures of 30 minutes. array[0] =  Sum of durations for all exposures when attenuation value was A <= X. array[1] =  Sum of durations for all exposures when attenuation value was X < A <= Y. array[2] =  Sum of durations for all exposures when attenuation value was Y < A. Use the attenuationDurationThresholds to configure the X and Y values. note: This value is only available when ENAPIVersion is set to 1 in the app’s Info.plist file.

## See Also

### Exposure Criteria

- [daysSinceLastExposure](exposurenotification/enexposuredetectionsummary/dayssincelastexposure.md)
- [matchedKeyCount](exposurenotification/enexposuredetectionsummary/matchedkeycount.md)
- [maximumRiskScore](exposurenotification/enexposuredetectionsummary/maximumriskscore.md)
- [maximumRiskScoreFullRange](exposurenotification/enexposuredetectionsummary/maximumriskscorefullrange.md)
- [riskScoreSumFullRange](exposurenotification/enexposuredetectionsummary/riskscoresumfullrange.md)
- [metadata](exposurenotification/enexposuredetectionsummary/metadata.md)
- [daySummaries](exposurenotification/enexposuredetectionsummary/daysummaries.md)