GPRS modem rs4232 1.Standard industrial 2.Various working mode 3 ARM7 CPU wireless modem 4. Vending machine, AMR GPRS modemrs232 used for AMR KB3030 ... the public net, KB3030 SMS group sending GSM / GPRS MODEM transmit widely, stably and reliably, KB3030 GPRS DTU is widely used in unattended operation ... °C-80°C, communication is not effected at -40°C. GPRS modem rs232 used for AMR