Redmi note 3 is really a excellent mobile at this price range . I am using this mibile from last 6_ 7 months and its working great. This mobile is ment for gaming , multimedia , camera and many more.
Specification
This mobile has IR Sensor with allow you to control every TV, AC , Set uo box and etc. This mibile has all the sensors you want for example accelerometer , gravity sensor , magnetometer , IR sensor and etc. This mobile has Snapdragon 650 which ia really very powerful processor.
RAM
This mobile come with 3GB/2GB of ram depending upon the varient. This mobile allow you to play all the game you want because of its high ram.
Camera
This mobile comes with 16 Mega Pixel Rare camera and 5 Mega Pixel front camera with really amazing focus.it takes photo at very high speed and images taken by this phone is very stable as compared to other
Battery
This phone can be also called as power bank because it has huge 4050 mah battery which can run over 9_ 14 hours if you use it continue.the average life of battery is 1_ 3 days. You dont need to charge your phone for 1-3 days.
Other feature
It comes with great finger print scanner which can be used to take selfi and unlocking all application and mobile.
The body of the mobile is made up of metal and its unibody mobile with unremoveable battery
If you have range of 12000 then go for redmi note 3 because I am using this mobile since 6 months.