... Sim Card,up to 38400 SMS per hour,SMS,MMS,FAX,VOICE,AT COMMAND,TCP/IP.Works Windows 2008 R2,Vista,Win7 ... with independent switch controlled Each individually removable, easy maintenance 64 modem in one box, convenient and diligent Big and small SIM ... driver*1Running enviroment NEW SIM5216J 3G HSDPA WCDMA 64 Port Modem Pool