# HomeAccessoryRangeSettingDescriptor A type that describes the bounds of a range setting. ``` protocol HomeAccessoryRangeSettingDescriptor ``` ## Overview You don’t adopt this protocol directly. Standard range types, such as `ClosedRange`, adopt it, so you can pass a range expression like `0...100`. ## Topics ### Definining a range [`var rangeLowerBound: Self.Bound?`](/documentation/HomeExtensions/HomeAccessoryRangeSettingDescriptor/rangeLowerBound) The range’s lower bound, if it has one. [`var rangeUpperBound: Self.Bound?`](/documentation/HomeExtensions/HomeAccessoryRangeSettingDescriptor/rangeUpperBound) The range’s upper bound, if it has one. [`associatedtype Bound : Comparable, Numeric`](/documentation/HomeExtensions/HomeAccessoryRangeSettingDescriptor/Bound) The type of the range’s bounds. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)