... Required Keys Ref ID Battery2400 mAh Internal Memory 256MB ROM+128MB RAM External Memory Connector Micro SD, up to 16GB Camera ... , Serial, SPI interface, built-in bar code scanning, credit card, RFID, fingerprint identification and other equipment. Mini18pin with headphone jack ... 256MB RAM Marvell 128MB Extended Storage Micro SD Max support memory card size16 GB USIMUSIM support Yes USIM Lock Yes USIM ...