Highlight 1,gsm (cdma) modem 2,sending bulk sms with sms software 3.16 sim cards slots 4,at command 5,support linux and all the operating systems 6 .16 multi port gsm modem overview gsm modem pool also known usb 2.0 can be used directly into the computer usb port, for laptops, desktops can be used. Break the rule that multi-tech can only be used in desktop computers. Built-in wireless modules can be inserted sim cards, simultaneously to send text messages. Modem pool connect with computer via usb 2.0 interface . Download driver .Install software .Than can process sms sending / receiving . Sms software we can provide to you or can work with customer sms software. Basic information: applications large shopping malls, supermarkets professional market, large wholesalers large hotels, large-scale entertainment large agencies transport, logistics industry large enterprises, and institutions large hospitals, large bookstore newspaper, television and radio stations oil company ( other chain business model) government agencies or large township product feature can insert 16 sim cards big or small connection with the computer through a data line can be integrated with usb pci card is optional each channel with separate power switch each individual module can be demolished industrial chassis, elegant shell.