Xiaomi Mi A1 is a Dual SIM smartphone with 5.5" capacitive touchscreen, Dual 12MP rear cameras and 5MP front camera. Under the hood it holds Qualcomm MSM8953 Snapdragon 625 Octa-core 2GHz processor, and runs with Android Nougat operating system with 4GB RAM and 64GB internal memory. It has a battery capacity of 3080 mAh and microSD card slot up to 256GB.

64GB Internal Storage / 4GB RAM Memory Dual SIM (Micro-SIM) IPS LCD capacitive touchscreen, 16M colors 6.44 inches 1080 x 1920 pixels (~342 ppi pixel density) Android OS 7.1.1 (Nougat) Qualcomm MSM8953 Snapdragon 625 Octa-core ARM Cortex-A53 @2158MHz (Global ROM) 12MP Rear Camera / 5MP Front Camera Fingerprint (Front-mounted), Accelerometer, Gyroscope, Proximity 5300mAh Li-Ion Battery (Non-removable)

5.99 " FHD Display MIUI 9 (Based on Android 7.1) Snapdragon 625 Octa Core 4GB RAM 64GB ROM 12.0MP, 1.25μm Large pixel, Support PDAF, Face recognition 5.0MP, Smart Beauty 3.0, Selfie timer Qualcomm MSM8953 Snapdragon 625 , Octa-Core Non-removable Li-Po 4000 mAh

Brand Name:Xiaomi Model Number:Redmi 6A Design:Bar Screen:≥5.0", 5.45-inch 1440x720p Camera:> 7MP Operation System:ANDROID Display Color:Color Feature:3G, Auto Focus, Bluetooth, Build in Flash, Dual SIM Card, EMAIL, FM Radio, GPS Navigation, MP3 Playback, Touch Screen, WiFi Screen Resolution:1920x1080 Display Type:IPS RAM:2GB ROM:16GB CPU:Helio A22 Quad Core SIM Card:Dual Sim Card Camera Type:13MP Rear Camera, 5MP Front Camera Battery:3000mAh(Typ)/2910mAh (Min) OS:MIUI 9

Xiaomi Redmi Note 4  With 64 GB Internal memory and 4 GB RAM,LCD touchscreen 5.5 Inch Display of 1080 x 1920 pixels Resolution . Xiaomi Redmi Note 4 has Octa-core processor and Yes primary ,Yes Secondary Camera with LED Flash . It comes with Android 6.0 (Marshmallow) MIUI 8.