Mi 4 is very good piece mi 4 have 64GB, 32GB, 16GB internal and also have 3GB, 4GB RAM . Rare camera is 13 MP, 8 MP front camera, Both sim1 and sim2 sluts are 4G capable sluts, In mi 4 have black and silver and gold colour, Very good HD display . MI 4 have finger print option at rare side below the back camera and very good flash light, auto focusing camera and very good pixel clarity at day or night, present every mobile must required battery backup so mi4 have good battery backup . Good sound also very slime light weight very good piece .I recommend this mi4 to buy