1.8 ports gsm sms modem 2.USB&RS232 suppport 3.Dual-band 4,8 ... volume, send and receive text messagees,Generally have serial ports, USB ports and RS232 port and other interfaces. The benefits ... W15*H12(cm)Accessories:AC/DC adapter,RS-232/USB cable,Antenna and mounting CDAttentionPls choose the right ... -band 850/900/1800/1900mh)and Interface(USB port or RS232 port) 8 ports GSM SMS modem pool support ...