... TCP/IP stack, supports transparent data transmission, AT Command, RS232/485, remote configuration and control, with embedded Operation System, ... . EGSM900/GSM18002. GPRS multi-slot class 103. Compliant to GSM phase 2/2+4. Support SMS and data function ... . Support telnet function16. Support remote configure and control17. Easy to upgrade firmware18. Support multi OS, such as WINDOWS, LINUX, ...