10: The audio route is a Bluetooth device using the A2DP protocol.
5: The audio route is a Bluetooth device using the HFP protocol.
-1: The default audio route.
1: The audio route is an earpiece.
0: Audio output routing is a headset with microphone.
2: The audio route is a headset without a microphone.
4: The audio route is an external speaker. (iOS only)
3: The audio route is the speaker that comes with the device.
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The type of the audio route.