What camera resolutions does IUNI U2 feature?

Here are details about the IUNI U2's camera sensors:
Rear Camera : 15.9 megapixel
Front Camera : 4.1 megapixel
Flash : Yes
Camera Options :
+ Autofocus
+ Continuous shooting
+ Digital image stabilization
+ Digital zoom
+ Exposure compensation
+ Face detection
+ Geotagging
+ ISO settings
+ Macro mode
+ Scene mode
+ Self-timer
+ Touch focus
+ White balance settings
Slow Motion Video : Yes , 60.0 fps