1 usb gsm bulk sms modem 2 Manufacture 8 ports gsm modem 3 SMA antenna connector gsm modem usb 4 bulk sms terminal gsm ... messages, send speed as 8 times as a single channel modem. It uses the development of WAVECOM module, 220V power supply ... 2008 R2,Windows 7,Vista,XP,2006/2000,98SE/CE,LINUX,MAC Key Feature: Just like 8 single-channel equipments work ...