# CMIOExtensionDeviceProperties An object that defines the properties of a device. ``` class CMIOExtensionDeviceProperties ``` ## Overview Create an instance of this object to manage the device’s property state. ## Topics ### Creating Device Properties [`+ (instancetype) devicePropertiesWithDictionary:(NSDictionary *) propertiesDictionary;`](/documentation/CoreMediaIO/CMIOExtensionDeviceProperties/devicePropertiesWithDictionary:) Returns a new properties object with a dictionary of property states. [`init(dictionary: [CMIOExtensionProperty : CMIOExtensionPropertyState])`](/documentation/CoreMediaIO/CMIOExtensionDeviceProperties/init(dictionary:)) Creates a properties object with a dictionary of property states. ### Configuring Device Properties [`var model: String?`](/documentation/CoreMediaIO/CMIOExtensionDeviceProperties/model) A device model string. [`var linkedCoreAudioDeviceUID: String?`](/documentation/CoreMediaIO/CMIOExtensionDeviceProperties/linkedCoreAudioDeviceUID) A universal identifier of the audio device linked to this device. [`var transportType: Int?`](/documentation/CoreMediaIO/CMIOExtensionDeviceProperties/transportType-96gm) The transport type of the device, such as USB or HDMI. [`var suspended: Bool?`](/documentation/CoreMediaIO/CMIOExtensionDeviceProperties/suspended-eru0) A Boolean value that indicates whether the device is in a suspended state. [`@property (atomic, strong, nullable) NSNumber * transportType;`](/documentation/CoreMediaIO/CMIOExtensionDeviceProperties/transportType-25qzh) The transport type of the device, such as USB or HDMI. [`@property (atomic, strong, nullable) NSNumber * suspended;`](/documentation/CoreMediaIO/CMIOExtensionDeviceProperties/suspended-2ja7h) A Boolean value that indicates whether the device is in a suspended state. [`func setPropertyState(CMIOExtensionPropertyState?, forProperty: CMIOExtensionProperty)`](/documentation/CoreMediaIO/CMIOExtensionDeviceProperties/setPropertyState(_:forProperty:)) Sets the value of a device property. [`var propertiesDictionary: [CMIOExtensionProperty : CMIOExtensionPropertyState]`](/documentation/CoreMediaIO/CMIOExtensionDeviceProperties/propertiesDictionary) A dictionary of properties for a device. ## Relationships ### Conforms To [`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol) [`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible) [`Equatable`](/documentation/Swift/Equatable) [`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible) [`CVarArg`](/documentation/Swift/CVarArg) [`Hashable`](/documentation/Swift/Hashable) ### Inherits From [`NSObject-swift.class`](/documentation/ObjectiveC/NSObject-swift.class) --- 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)