Series 3 (GPS + Cellular) Features
 
Space Gray aluminum case
LTE and UMTS
Built-in GPS, GLONASS, Galileo, and QZSS
S3 with dual-core processor
W2 Apple wireless chip
Barometric altimeter
Capacity 16GB1
Optical heart sensor
Accelerometer and gyroscope
Ion-X strengthened glass
Ceramic and sapphire crystal back (center)
Wi-Fi (802.11b/g/n 2.4GHz)
Bluetooth 4.2
Up to 18 hours of battery life2
Water resistant 50 meters3
watchOS 5
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