GSM/GPRS modem with TCP/IP stack Qual band 850/1900MHz or 900/1800MHz RS-232 interface Open AT Command Support: SMS, MMS, Voice, Fax-depends on module Support: Windows 2000/Me/XP, SCO UNIX, SCO XEINX, Linux Features: GSM quad-band GPRS class 10 Voice/data/fax/SMS TCP/IP: Full (FTP and E-mail added). Functional features: Input/output digital: 1 Download over the air: Optional AT command set: >300 Auto-restore timer reset: Yes Voice, data and SMS features: Data circuit asynchronous, transparent and non-transparent up to 14, 400-bit/second Automatic fax group 3(class 1 and class 2) MNP2, V. 42bis Text and PDU SMS (MT/MO) UCS2 character set management Other features: Operating status LED Casing: Metal DIN rail mounting. Interface: SIM plug-in card reader: 1.8/3V RS232 on 15-pin sub-D connector Pin power supply connector: 4-pin DC SMA antenna connector (50 Ohms) Dimension metal . Size: 88 x 66 x 26mm Weight: 100g.