Apple Watch Series 2 Nike+ 38mm Space Gray Aluminum Case with Anthracite/Black Nike Sport Band (MQ162)

Silver aluminum case
S2 dual-core processor
Built-in GPS
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

Series 2
Height: 42.5mm
Width: 36.4mm
Depth: 11.4mm
Case Weight: 34.2g