... fast sending sms 2,RS232 & USB & RJ45 3,800/850/900/1800Mhz 4,software support 5,serial port gsm modem The device built ... with USB 3, Each channel with separate power switch4, Each individual module can be demolished5, industrial chassis, elegant shell serial port ... ( other chain business model)♦Government agencies or large township serial port gsm modem Supported Operating Systems: All popular 32-bit ...