... Interface: RS232, RS485 Standard and Band: GSM850/900/1800/1900MHz 3G modem. Designed with industrial grade, supports SMS, CSD, RS232, AT Commands ... ~230400bits/s Indicator lights: "Power", "ACT", "Online"Antenna interface: Standard SMA female interface, 50 ohmSIM/UIM interface: Standard user card interfacePower ...