64-bit dual-core S4 processor. Up to 2x faster than S3 processor
Electrical heart sensor (ECG app)
Second-generation optical heart sensor
Fall detection
Apple Watch Series 4 (GPS, 44MM) – Space Gray Aluminum Case with Black Sport Band (Renewed) is the perfect way to show your team spirit! This Apple Watch Series 4 (GPS, 44MM) – Space Gray Aluminum Case with Black Sport Band (Renewed) is a cool way to show your favorite team spirit.
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Digital Crown with haptic feedback
