• 45mm or 41mm case size
• Aluminum or stainless steel
• Speaker
• Microphone
• Digital Crown with haptic feedback
• Side button
• Double tap gesture
• On-Device Siri
• Always-On Retina LTPO OLED display
• Edge-to-edge display
• Ion-X front glass (Aluminum cases)
• Sapphire front crystal (Stainless steel cases)
• Up to 2000 nits brightness
• 1 nit minimum brightness
• S9 SiP with 64-bit dual-core processor
• 4-core Apple Neural Engine
• 64GB capacity
• Blood oxygen sensor and app
• Electrical heart sensor and ECG app
• Third-generation optical heart sensor
• High and low heart rate notifications
• Irregular rhythm notifications
• Sleep stages
• Temperature sensing⁶
• Compass
• Always-on altimeter
• High-g accelerometer
  • Up to 256 g-forces with Fall Detection and Crash Detection
  • High dynamic range gyroscope
• Ambient light sensor
• Emergency SOS
• International emergency calling
• Crash Detection
• Fall Detection
• Water resistance 50m (swim proof)
• Dust resistance IP6X
• L1 GPS, GNSS, Galileo, and BeiDou
• LTE and UMTS¹³
• Wi-Fi 4 (802.11n)
• Bluetooth 5.3
• Second-generation Ultra Wideband chip
• Apple Pay
• GymKit
• Built-in rechargeable lithium-ion battery
• Up to 18 hours
• Up to 36 hours in Low Power Mode
• USB-C magnetic fast charging cable
• Operational temperature: 32°F to 95°F (0°C to 35°C)
• Nonoperational storage temperature: 4°F to 113°F (-20° to 45°C)
• Relative humidity: 5% to 90% noncondensing
• Operating Altitude: 0 feet to 10,000 feet (0 m to 3000 m)

Also available in stainless steel: