Hold MENU, and select Settings > Sensors & Accessories > Wrist Heart Rate.

Status

Enables or disables the wrist heart rate monitor. The default value is Auto, which automatically uses the wrist heart rate monitor unless you pair an external heart rate monitor.

NOTE: Disabling the wrist heart rate monitor also disables the wrist-based pulse oximeter sensor. You can perform a manual reading from the pulse oximeter glance.

While Swimming

Enables or disables the wrist heart rate monitor during swimming activities.

Abnormal Heart Rate Alerts

Sets the watch to alert you when your heart rate exceeds or drops below a target value (Setting an Abnormal Heart Rate Alert).

Broadcast Heart Rate

Broadcasts your heart rate data to a paired device (Broadcasting Heart Rate Data).