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Avantree Support
Headphones
Duet-Extra
Duet-Extra
Duet-Extra User Manual
Duet-Extra Power & Charging related
Duet-RX Product Overview - Buttons, Indicators & Function Table
How to Add Duet-Extra to Duet as Additional Headphone
Fail to add Duet-Extra to the Avantree Audio System (Duet/Quartet/Audiplex)