---
title: HMCharacteristicTypeFirmwareVersion
framework: homekit
role: symbol
role_heading: Global Variable
path: homekit/hmcharacteristictypefirmwareversion
---

# HMCharacteristicTypeFirmwareVersion

The firmware version of the accessory.

## Declaration

```swift
let HMCharacteristicTypeFirmwareVersion: String
```

## Discussion

Discussion The corresponding value is a string.

## See Also

### Deprecated characteristic types

- [HMCharacteristicTypeManufacturer](homekit/hmcharacteristictypemanufacturer.md)
- [HMCharacteristicTypeModel](homekit/hmcharacteristictypemodel.md)
- [HMCharacteristicTypeSerialNumber](homekit/hmcharacteristictypeserialnumber.md)