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45mm or 41mm
Swimproof1
Most crack-resistant
front crystal
Certified IP6X dust resistant1
Always-On Retina display
Nearly 20% larger than
Apple Watch SE
Over 50% larger
than Series 3
Blood Oxygen app2
High and low heart
rate notifications
Irregular heart
rhythm notification4
Emergency SOS5
International
emergency calling6
Fall detection
Cellular available7
Family Setup — pair multiple
watches with one iPhone8
44mm or 40mm
Swimproof1
Retina display Over 30% larger than Series 3
High and low heart
rate notifications
Irregular heart
rhythm notification4
Emergency SOS5
International
emergency calling6
Fall detection
Cellular available7
Family Setup — pair multiple
watches with one iPhone8
Apple Watch Series 3
Swimproof1
Retina display
High and low heart
rate notifications
Irregular heart
rhythm notification4
Emergency SOS5
International
emergency calling6
Fall detection