This study is looking at how safe and effective the **Sentio system** is for teenagers aged 12-17 with certain types of hearing loss. The study is being done at multiple locations and will collect data from these young people who already use devices like hearing aids. **Key points** for participants to consider: - **Study Duration**: The time you are involved in the study can vary, and you will need to follow the study procedures as instructed. - **Visits**: You will need to visit the study center for check-ups and procedures. Your parents or guardians will also need to agree to these visits. - **Risks and Benefits**: While the study aims to help with hearing loss, there are some risks, like surgery and potential allergic reactions. It's important to talk to your doctor and family to understand if this study is right for you. Before joining, your parent or guardian must sign a form saying you both understand what the study involves. You cannot participate if you have certain medical conditions or if you've been in another study recently. Always ask questions if you're unsure about anything!