The Steel tracks:

• Steps
• Distance
  - Based on your user profile (gender and height)
• Calories burned
• Running
  - Automatically detected
• Swimming
  - Automatically detected
• Sleep
  - Time it takes to fall asleep
  - Duration
  - Sleep cycles (light and deep sleep)
  - Sleep interruptions

It does not track:

• Cycling
• Elevation
• Heart Rate
• SpO2

We're working on adding new features.