I am using this Redmi 4a mobile from 1 years .I bought it from Flipkart. This is mobile phone has android Marshmallow with fastest operating system .It has very attractive user interface miui8 and now update is coming soon which miui9 .This is the best product in affordable prices .Its sound quality is excellent. Camera is very clear and good quality pictures are captured.It support usb otg. But it does not have finger print scanner which is available in mi4. I can say that this is the best Android Phone in only Rs6999. As the company giving the update of Nougut version for next latest updat which is coming very soon.