Silver aluminum case
S2 dual-core processor
Built-in GPS and GLONASS
Water resistant 50 meters2
Ion-X glass
2x brighter OLED Retina display with Force Touch (1000 nits)
Ceramic back
Digital Crown
Heart rate sensor, accelerometer, and gyroscope
Ambient light sensor
Direct fire speaker and microphone
Wi-Fi (802.11b/g/n 2.4GHz)
Bluetooth 4.0
Up to 18 hours of battery life3
watchOS 3