---
title: Attenuation
framework: exposurenotification
role: collectionGroup
role_heading: API Collection
path: exposurenotification/attenuation
---

# Attenuation

The minimum and maximum signal attenuations.

## Overview

Overview important: This property is available in iOS 12.5, and in iOS 13.6 and later.

## Topics

### Constants

- [ENAttenuationMax](exposurenotification/enattenuationmax.md)
- [ENAttenuationMin](exposurenotification/enattenuationmin.md)

## See Also

### Enumerations

- [Risk Level](exposurenotification/risk-level.md)
- [Risk Level Value](exposurenotification/risk-level-value.md)
- [Risk Score](exposurenotification/risk-score.md)
- [Risk Weight](exposurenotification/risk-weight.md)
- [ENActivityFlags](exposurenotification/enactivityflags.md)
- [ENCalibrationConfidence](exposurenotification/encalibrationconfidence.md)
- [ENDiagnosisReportType](exposurenotification/endiagnosisreporttype.md)
- [ENInfectiousness](exposurenotification/eninfectiousness.md)