As we already know that mi going great with all new and fully upgraded mobile and also gadgets.
In that process it came with new mobile that is mi4 with fully upgraded updates they are first of all it is upgraded to marsh melllow 6.0 and awesome battry backup of 4100mah that wsa really cool .
Next it runs with snapdragon 435 octa core processor and it had sensored with 0.1 sec ultra fast sensor.
Comming to external looks it has gorilla glass with 2.5 d curved looks pitty awesome and it also has cool feature that is IR which can controll any TV.
So friends I suggest you people to buy black colour because it looks awesome in black so go with that.