1 usb gsm bulk sms modem 2 Manufacture 8 ports gsm modem 3 SMA antenna connector gsm modem usb 4 bulk sms terminal gsm modem 8 USB GSM Bulk SMS Modem Description:The device built-in 8 wireless modules can be inserted eight SIM cards, can use eight cards to send text messages, send speed as 8 times as a single channel modem. It uses the development of WAVECOM module, 220V power supply, can be a ...