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# Audio Route Description Dictionary Keys

Keys for the [`kAudioSessionProperty_AudioRouteDescription`](/documentation/AudioToolbox/kAudioSessionProperty_AudioRouteDescription) dictionary.

## Topics

### Constants

[`let kAudioSession_AudioRouteKey_Inputs: CFString!`](/documentation/AudioToolbox/kAudioSession_AudioRouteKey_Inputs)

An object containing details about audio input used in the current audio route.

[`let kAudioSession_AudioRouteKey_Outputs: CFString!`](/documentation/AudioToolbox/kAudioSession_AudioRouteKey_Outputs)

An object containing details about the audio output used in the current audio route.


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