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GSM Modem 82GM VISIONTEK 82GM is a highly flexible plug-n-play GSM modem for easy integration with RS-232 and audio* interface. It is equipped with features of circuit switched data, SMS, PC, Fax, Voice* and GPRS (Class 10). GSM Commercial Modem 81GC VISIONTEK 81GC is a highly flexible plug-n-play GSM modem for easy integration with RS-232 and audio* interface. It is equipped with features of circuit switched data, SMS, Fax, Voice and GPRS (Class 10). CDMA Commercial Modem 81QC[...]