... RS232, RS485 Standard and Band: GSM850/900/1800/1900MHz 3G modem. Designed with industrial grade, supports SMS, CSD, RS232, AT Commands, with ... the function of accessing internet by dial-up, etc. It has been used for sending SMS, alarm system, data transmission ... 900/1800/1900MHz3. GPRS/EDGE CLASS 124. ... g6. OthersOperation temperature: -30~+75CStorage temperature: -40~+85CHumidity ...