The vívoactive^® HR device has a wrist-based heart rate monitor and is also compatible with ANT‍+^® chest heart rate monitors. You can view wrist-based heart rate data on the heart rate widget. When both wrist-based heart rate and ANT‍+ heart rate data are available, your device uses the ANT‍+ heart rate data. You must have a heart rate monitor to use the features described in this section.