Inclusion Criteria:  Subject is 18 years or older Willing and capable to provide written informed consent and agrees to participate in all protocol required activities Subjects must meet one of the following criteria: Documented New York Heart Association (NYHA) class II or III heart failure within the last 6 months  OR  Subjects that have a known heart condition (non-heart failure) and are at risk of developing an abnormal heart rhythm, or have symptoms that may suggest a cardiac arrhythmia such as dizziness, palpitations, syncope, chest pain and/or shortness of breath  Exclusion Criteria:  Not able to walk continuously for a period of 6 minutes Prior hospitalization or surgery within previous 6 r weeks prior to consent. Cardiovascular event such as unstable angina or myocardial infarction within previous 6 weeks prior to consent. Subject is currently enrolled in another clinical trial (excluding registries) that may interfere with the placement of the study system Known allergy to materials used in the study (adhesive tape, titanium, ECG electrodes) Subject is pregnant as indicated by subject report and/or medical record at the time of enrollment Subjects with rash or open wound on torso locations where investigational devices will be placed Have an active implantable device Any past or current medical event that could represent a risk for the subject to perform the study required activities in the opinion of the investigator Any medical signs or symptoms that in the opinion of the investigator could represent a risk for the subject (I.e. increased baseline blood pressure or heart rate).