-band GSM/GPRS/EDGE 850/900/1800/1900 MHz. Support double data centers, one main and another backup. Connecting TCP/IP and sending SMS via AT commands. 1 RS232 serial port and 1 RS485 serial port (not use simultaneously). Flow Control: /Transparent mode(TCP/UDP)/https client/SMS mode. Standard : GSM. Rate : 14.4 Kbps ~ 57.6 Kbps. Standard Frequency Range : 850/900/1800/1900MHzGPRS Multi-slot Class : GPRS GPRS Terminal Device Class : Class B. GPRS Coding Schemes : CS1 ~ CS4Max Launch Power : GSM900 class4 (2W), DCS1800 class1(1W). Application : GSM standard AT instruction set / extension AT instruction set / data transmission / SMS transmissionNetwork Protocol : TCP, UDP, DNS, httpsNetwork Link Count : 4Disconnection Buffer : 4 x 15K bytesNetwork Receive Buffer : 4K SerialPort Number : 2 (1*-232, 1*-485, can not work at the same time)Interface Standard : -232: DB9 cellular type, -485: 2 wire (A+, B-)Data Bit : 5, 6, 7, 8Stop Bit : 1, 1.5, 2Check Bit : None, Even, Odd Rate : UART: 2400 ~ 921600 Flow Control : /Receive Buffer : 4K -485 Pull-up and Pull-down Resistor : 2.2 KDevice InterfaceAntenna Interface : 50/SMA-K (female terminal) : 1.8V / 3VSpeech Interface : NullSoftwareVirtual Serial(-) : Windows 2000 or higher (32 bit/64 bit)Configuration : Serial AT , network AT , SMS AT Basic ParametersOperating Temp. : -25 ~ 85CStorage Temp. : -40 ~ 125CWorking Current : Average: 22 ~ 45mA, Max: 201mAColour:As ShownPlug Type:EU Plug,it applies to Indonesia, Germany, France, , Italy and so onVoltage: AC100-240VMaterial:plasticPackage Contents:2 x Modem SerialOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.