Model No.: S21UCPU: MT6889+ Deca Core (Latest 10 Core)SIM/TF: 2 SIM Card Slots (Nano SIM) + 1 TF Card Slots (Maximum support extension 256GB)Screen: 6.9Inch Drop ScreenResolution :1440*3200Camera: Front Camera 32MP+ Rear Camera 64MPMemory:16GB RAM+512GB ROMSystem: Android 11 SystemBattery: 6800mAh High Density Lithium-ion batteryUnique Back Cover: Hot Bend 3D Plating Gradient Glass Back Cover. It is art, it is also technology!Net-Work: GSM850/900/1800/1900MHz, 3G: WCDMA850/1900/2100MHz, 4G，5GVibration:SupportMulti Media: MP3/MP4/3GP/FM Radio/BluetoothMulti Function: Full screen, Face recognition, finger print, Dual SIM, Wifi, GPS, Gravity Sensor, Alarm ,Calendar,Calculator,Audio recorder ,Video recorder, WAP/MMS/GPR, Image viewer,E-Book,World clock