Features
LTE and UMTS2
Built-in GPS and GLONASS
Wi-Fi (802.11b/g/n 2.4GHz)
Bluetooth 4.2
Barometric altimeter
Water resistant to 50 meters1
Heart rate sensor
Accelerometer
Gyroscope
Ambient light sensor
Siri speaks
Capacity 16GB
Ceramic back

Display
Second-generation OLED Retina display with Force Touch
2x brighter (1000 nits)
Sapphire crystal (stainless steel and ceramic cases)
Ion-X glass (aluminum cases)
312 by 390 pixels (42mm)

Chip
S3 dual-core processor
W2 Apple wireless chip

Dimensions
42mm
Height: 42.5mm
Width: 36.4mm
Depth: 11.4mm
Case Weight: 34.9g 42mm (Stainless Steel) Case Weight 52.8g

Connectivity
Wi-Fi (802.11b/g/n 2.4GHz)
Bluetooth 4.2

Power and Battery
Built-in rechargeable lithium-ion battery
Up to 18 hours3
Magnetic charging cable
USB power adapter