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# Accessory Access

Manage access to connected USB accessories.

## Discussion

The AccessoryAccess framework provides access to connected USB devices that use the <doc://com.apple.documentation/documentation/IOUSBHost> framework, allowing clients to express interest through one or more registered accessory listeners.

## Topics

### Managing accessories

[`AAUSBAccessoryManager`](/documentation/AccessoryAccess/AAUSBAccessoryManager)

A class your app uses to manage USB accessories and the listener objects for those accessories.

[`AAUSBAccessory`](/documentation/AccessoryAccess/AAUSBAccessory)

A class that represents a USB accessory.

### Identifying specific USB accessories

[`AAUSBAccessoryMatchingCriteria`](/documentation/AccessoryAccess/AAUSBAccessoryMatchingCriteria)

A class that represents the accessory matching criteria for a USB accessory.

### Responding to changes in accessory status

[`AAUSBAccessoryListener`](/documentation/AccessoryAccess/AAUSBAccessoryListener)

A class that conforms to the framework’s USB accessory listener protocol can listen to the accessory events.

### Errors

[`AAError`](/documentation/AccessoryAccess/AAError)

Values that describe errors the AccessoryAccess framework returns.

[`AAErrorDomain`](/documentation/AccessoryAccess/AAErrorDomain)

The string that represents the framework’s error domain.


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