If u r considering to buy a smartphone in only 4000 then no other phone can beat its performance .
It comes with latest android due to its contract with google and most importantly its hardware is also made by google so you r in safe hands when buying this phone.
I know that many people dont like karbonn phones and not me either but due to google's hands in its making I bought it and till now no major performanece issue have found and we r happy to own this.
Specs:
4.5 display
Red , white color
1gb ram
Quad core processor
Latest android
5mp camera