Micromax Canvas 4 plus is a good phone under 12k but now it is outdated.
Talking about the specifications it has a 5 inch 720p AMOLED Display, with 1 GB ram and a mediatek octacore processor. It has a GPU of Mali 450p which is capable of handling low end games and some medium end games, it has 16GB of internal storage and has a dedicated slot for expanding the storage upto 32GB.
Talking about the camera it has a 13MP backshooter and a 5MP front shooter and which is capable of recording full HD 1080p videos.but the camera performs good onlh in day light conditions, it's low light imaging is worst.
Talking about the battery performance it can last only upto 3-3.5 hours with heavy usage on a single full charge.
For the first 1 to 1.5 years it would be working fine but after some time it may give problems like hanging.
Pros: -
1.very light weight phone
2.good voice reception
Cons: -
1.Battery backup
2.bad ram management
3.average camera