Memory, Storage & SIM: 4GB RAM | 64GB internal memory expandable up to 256GB | Dual SIM (nano+nano) dual-standby (4G+4G) 4030mAH lithium-ion battery, AI Scene detection: Detects up to 12 different scenes ; Supports Quick Charge 3.0 Technology and 18W Fast Charge ; In-box 10W charger ; Type-C charging port ; Built-in rechargeable battery Box also includes: Power adapter, USB cable, warranty card, user guide, SIM tray ejection tool and back cover The low SAR value(1.6W/kg) of Mi A3 means that a minimal amount of RF energy is absorbed by the body when using a mobile phone, making it extremely safe