---
title: HMCharacteristicTypeSecuritySystemAlarmType
framework: homekit
role: symbol
role_heading: Global Variable
path: homekit/hmcharacteristictypesecuritysystemalarmtype
---

# HMCharacteristicTypeSecuritySystemAlarmType

The alarm trigger state.

## Declaration

```swift
let HMCharacteristicTypeSecuritySystemAlarmType: String
```

## Discussion

Discussion The corresponding value is one of the constants in the HMCharacteristicValueSecuritySystemAlarmType enumeration.

## Topics

### Values

- [HMCharacteristicValueSecuritySystemAlarmType](homekit/hmcharacteristicvaluesecuritysystemalarmtype.md)

## See Also

### Safety and security

- [HMCharacteristicTypeCurrentSecuritySystemState](homekit/hmcharacteristictypecurrentsecuritysystemstate.md)
- [HMCharacteristicTypeTargetSecuritySystemState](homekit/hmcharacteristictypetargetsecuritysystemstate.md)
- [HMCharacteristicTypeObstructionDetected](homekit/hmcharacteristictypeobstructiondetected.md)
- [HMCharacteristicTypeOccupancyDetected](homekit/hmcharacteristictypeoccupancydetected.md)
- [HMCharacteristicPropertyRequiresAuthorizationData](homekit/hmcharacteristicpropertyrequiresauthorizationdata.md)