Specifications

• Screen Size

  46 millimeters
  Operating System Compatibility

  Apple iOS
  Operating System

  watchOS
  App Compatible

  Yes
  Built-in Storage

  64 gigabytes
  Metrics Measured

  Electrocardiography (ECG), Steps taken, Hours slept, Resting heart rate, Target heart rate, Skin temperature, Altitude changes, Cadence, Cycling speed, Distance traveled, Duration of sleep stages, Laps swam, Pace, Route, Water temperature