Study Purpose: This study aims to see how well the Cordio HearO System works. The study is "observational," meaning it watches what happens without changing anything. It is also "blinded," which means the results are not shown to everyone to avoid bias.

Study Design: The study lasts up to 24 months. Patients will use an app to record their voices daily. These recordings help researchers understand the system's performance. The study has two periods. The "Run-In" period is for getting used to daily recordings. The "Core" period is when patients are closely followed and continue daily recordings.

Who Can Join: You must be 22 or older, have chronic heart failure, and meet specific health criteria to participate. You also need to be comfortable using the app every day and willing to sign a consent form.

• Study lasts up to 24 months with daily recording.
• No new treatment is given; it's observational.
• Check eligibility requirements closely before joining.