The mi a1 comes with snapdragon 625 and has 4gb of ram so performance is super smooth. It has 64gb of storage and also has an option of expansion of storage thanks to its hybrid sim slot which can be used for 2 sim cards or 1 sim and 1 sd card. The phone has a 5.5inch full hd display at 1080*1920pixel resolution. The phones has a 3080mah battery which is sufficient to complete a day in a single charge. One of the best features of the phone is its camera. It has dual rear camera of 12megapixels which are great in taking potrait shots and has a 5megapixel front facing camera. The camera is just amazing and you can capture some great shots from it. The phone runs on android nougat 7.1.2 out of the box and recently has a recevied the oreo update. As it is an android one phone it will receive updates for 2 years. The phones feel great in hand and not faced a single major issue yet. I would highly recommened buying this phone and there is no other phone in this price range providing you such great features. But keep in mind that the after sales service of xiaomi is not that great.