... : RS232, RS485 Standard and Band: GSM850/900/1800/1900MHz 3G modem. Designed with industrial grade, supports SMS, CSD, RS232, AT Commands ... sending SMS, alarm system, data transmission, etc .Detailed information A. Wireless Specification1. UMTS/WCDMA/HSDPA/HSUPA 850/900/1900/2100MHz2. Quad ... -band EGSM 850/900/1800/1900MHz3. GPRS/EDGE CLASS 124. HSUPA: 5.76Mbps(UL) / HSDPA: 7.2Mbps( ...