:
Chip
Faster dual-core processor
Apple wireless chip
Features
Built-in GPS and GLONASS
Barometric altimeter
Water resistant 50 meters
Heart rate sensor
Accelerometer
Gyroscope
Ambient light sensor
Siri speaks
Capacity 16GB
Ceramic back
Connectivity
4G LTE and UMTS
Wi-Fi (802.11b/g/n 2.4GHz)
Bluetooth 4.2
Display
Second-generation OLED Retina display with Force Touch - 2x brighter (1000 nits)
Sapphire crystal (stainless steel and ceramic cases)
Ion-X glass
272 by 340 pixels (38mm)
312 by 390 pixels (42mm)
Power
Built-in rechargeable lithium-ion battery
Up to 18 hours
Magnetic charging cable
USB power adapter
Supports AirPower mat