History
Your device keeps track of your daily steps and sleep statistics, as well as your timed fitness activities and optional ANT+® sensor information. This history can be sent to your Garmin Connect™ account.
Your device stores your activity data for up to 3 weeks.
NOTE:
When using a heart rate monitor, your data storage is significantly reduced (approximately 12 days).
When the data storage is full, the device deletes the oldest files to make room for new data.