Product details of Realme C21 - 4GB / 64GB NO RETURN applicable if the seal is broken Processor CPU: Octa-core CPU, 12nm, up to 2.3GHz GPU: IMG GE8320 Operating System: realme UI Based on Android 10 RAM: 4GB / ROM: 64GB Display: 6.5" HD+ Mini-drop Fullscreen 89.5% Screen-to-body Ratio Primary Camera (Triple Camera): 13MP, 2MP, 2MP Macro lens 5MP AI selfie camera 5000mAh Massive Battery Cellular & Wireless 3-Card Slot 2 SIM Card + 1 MicroSD Frequency Bands: 2/3/4G： GSM: 850/900/1800/1900MHz WCDMA: Bands 1/5/8 FDD-LTE: Bands 1/3/5/7/8/20/28 TD-LTE: Bands 38/40/41（2535MHz-2655MHz） Wireless: 802.11 b/g/n Bluetooth 5.0 Sensors: Magnetic induction sensor, Light sensor Proximity sensor, Acceleration sensor Navigation: GPS/AGPS/Beidou/Glonass Ports: 3.5mm headset jack Micro-USB Dual nano-SIM and 1 Micro SD