GPS + Cellular model lets you call, text, and get directions without your phone
Measure your blood oxygen with an all-new sensor and app
Check your heart rhythm with the ECG app
The Always-On Retina display is 2.5x brighter outdoors when your wrist is down
S6 SiP is up to 20% faster than Series 5
5GHz Wi-Fi and U1 Ultra Wideband chip
Track your daily activity on Apple Watch and see your trends in the Fitness app on iPhone
Measure workouts like running, walking, cycling, yoga, swimming, and dance
Swimproof design
Sync your favorite music, podcasts, and audiobooks