Specifications

• Screen Size

  42 millimeters
  Operating System Compatibility

  Apple iOS
  Operating System

  watchOS
  Built-in Storage

  64 gigabytes
  Global Positioning

  GPS, Galileo, GLONASS, QZSS
  Metrics Measured

  Altitude changes, Blood oxygen, Resting heart rate, Skin temperature, Water temperature, Electrocardiography (ECG)