Hi Volusiano,
I was happy to get a prompt response from Oticon Customer Support:
Response from Oticon Customer Support re: “Mode button” function
Thank you for contacting Oticon. Regarding your inquiry, the “Mode” button on the TV Adapter 3.0 currently does not have a function to it. Please contact your local Hearing Care Provider periodically for any updates to the TV Adapter 3.0.
If you have any questions or need further assistance, please feel free to contact us again. Have a wonderful day!
Paul V
Consumer Support Specialist
Oticon, Inc.