Lyf Wind 4S is a one of the best battery backup smart phone from Lyf mobiles. It has a 4000 mah battery is enough for students enjoying 4g data services. It has a RAM 0f 2GB and 16 GB internal memory. the best advantage in this phone is it is not heat when we are playing games. we can enjoy the games in this phone. it has 8MP rear camera and 5MP front camera. photos clarities also very well. while taking selfies 5MP clarity is enough and we can enjoy video calls also. it is the best budget phone available in present market