1,gsm sms receiver software 2,RS232 & USB & RJ45 3,800/850/900/1800Mhz 4,software support 5,one year warranty 16 Ports bulk ... sms modem usb/gsm sms receiver software GSM Modem 16 sim cards, RJ45, Bulk SMS (Q2406-16 ... sms Modem usb modem multi port gsm modem /gsm sms receiver software