I buy Redmi 3S for gaming and long time battery power 4100 mAh. Redmi 3s have good processer and also include 16 gb internal memory which is further expandable by up to 128 GB with a micro sd card slot.and one another good thing is redmi 3s support OTG usb.About Speaker redmi have good voice quality during calls and phone rear camera is excellent 13- megapixel.but redmi 3s battery is non-removable.i feel it does a better job as compared to the redmi note 3.The front facing selfie camera is just about average with some noise.over all this phone is excellent smartphone these days.