Step and Walking Pattern From Cardiac Monitor Study

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 at the subjects baseline walking speed * Prior hospitalization or surgery that affects the subjects baseline walking speed at time of enrollment * Cardiovascular event such as unstable angina or myocardial infarction that affects the subjects baseline walking speed at time of enrollment * 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).