History
Your device keeps track of your daily steps and sleep statistics, as well as your timed fitness activities and optional ANT+® heart rate information. This history can be sent to your Garmin Connect™ account.
Your device stores your activity data for up to 4 weeks.
NOTE:
When using a heart rate monitor, your data storage is reduced.
When the data storage is full, the device deletes the oldest files to make room for new data.