Specifications: USB wireless GSM/GPRS moden Based on wavecom and siemens wireless modules. TCP/IP,open at. Send and receive data, fax, e-mail, sms Sending 38,400 sms per hour USB 2. 0 driver 32 sim card slots Wireless access to internet Comply with gsm phase 8+ standard Send and receive sms, mms, e-mail and data Maximum transmitting speed 115kbps Input voltage: 100v- 240v Working temperature: -20 to +60 Storage temperature: -25 to +70 Double tone multi-frequency function(dtmf) Send maximum 38400 sms per hour Supported operating systems: all popular 32-bit and 64-bit versions of windows are supported on both the server and client ends, including the latest revisions and service packs. windows 7 (home, premium, pro, ultimate, enterprise) windows vista (home, business, ultimate, enterprise) windows xp (pro and home) windows server 2003 (original and r2) windows 2000 (server and pro) windows 98se/ce linux 2. 40 mac 9. 8x weight: 18kg size: 495mm*480mm*125mm accessories: 1power cable, 1 usb 2. 0 cable, 64 sma antennas, 1 driver cd