45mm or 41mm
Swimproof
IP6X dust resistant
Always-On Retina display
Up to 1,000 nits
High and low heart
rate notifications
Irregular rhythm
notification
Temperature sensing
Cycle tracking
with retrospective
ovulation estimates
Emergency SOS
International
emergency calling
Fall Detection
Crash Detection
Retina display
Up to 1,000 nits
High and low heart
rate notifications
Irregular rhythm
notification
Emergency SOS
International
emergency calling
Fall Detection
Crash Detection
49mm
Swimproof
IP6X dust resistant
MIL-STD 810H certification
Action button
Always-On Retina display
Up to 2,000 nits
High and low heart
rate notifications
Irregular rhythm
notification
Temperature sensing
Cycle tracking
with retrospective
ovulation estimates
Emergency SOS
International
emergency calling
Fall Detection
Crash Detection
86-decibel siren
to attract attention