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Qx210 M2m Iot 4g Lte Modem Router Support Ethernet Vpn Wifi Sim Card Slot Serial Rs232/rs485 Port - 3g/4g Routers - AliExpress
IOT M2M Modem GSM 3G 4G DTU Supports Programmable Handshake Message Transparent Transferring SMS with TTL RS485 Port D223