... a long time stability, generous luxury housing. It is working compatible with windows 2008 R2, Windows 7, Vista, XP, 2006/2000, 98SE ... , LINUX. Module NO.FunctionFrequency(MHz)Q2303-32SMS(600pcs/hour by one port)900/1800Q2403-32SMS, MMS900/1800Q2406-32SMS , MMS, TCP ... Switched voice and fax♦V.42, V.42bis♦GPRS compatible♦WAP compatible♦SMA Antenna Interface♦SIM Card Outlet♦Power connector♦RS-232 ...