1,gsm sms sender 2,RS232 & USB & RJ45 3,800/850/900/1800Mhz 4,software support 5, ... one year warranty 16 Ports bulk sms modem usb/gsm sms sender GSM Modem 16 sim cards, RJ45, Bulk ... and Receiving Bulky SMS, MMS.The device built-in 16 wireless modules be inserted 16 SIM cards use 16 cards to ... support?in free,forever 16 ports GSM/GPRS sms Modem usb modem multi port gsm modem /gsm sms sender