The GSM20-ANT is a Maestro 100 Antenna with flying lead and SMA female connector. It is a ready-to-use GSM modem for voice, data, fax and SMS services. It also supports GPRS class-10 for hi-speed data transfer. Maestro 100 can be easily controlled by using AT command for all kinds of operations. With standard 9-pin RS232 port and telephone-like audio plug (via optional cable) the Maestro 100 can be set up with minimal effort.