5.5-inch (diagonal) Retina HD display with 1920-by-1080 resolution and wide color

3D Touch

CAMERA:

New 12MP cameras with optical zoom at 2x,

digital zoom up to 10x,

optical image stabilization,

Quad-LED True Tone flash, and Live Photos

Splash, water &  dust resistant

Processor : A10 Fusion chip with integrated M10 motion co-processor

VIDEO:

4K video recording @ 30 fps and video recording for 1080p @ 120 fps

7MP FaceTime HD camera with Retina Flash 

Touch ID with fingerprint sensor inbuilt into the new Home button itself

Connectivity :

LTE Advanced² up to 450 Mbps and 802.11a/b/g/n/ac Wi-Fi with MIMO

Operating :

iOS 10 and iCloud