... SIM 1 + SIM 2), 3 standby channels (GSM A + GSM B + PSTN) 5 working modes can be selected ... can be set Support polarity reversal signal for GSM metering Provide RMS (remote management system) for ... KPa GSM parameters Frequency bands: GSM 850MHz, GSM 900MHz, GSM 1800MHz (7 kinds) GSM 1900MHz, GSM 850/1900MHz, GSM 900/1800MHz, GSM 900 ... 7dBi Yagi antenna is optional gsm fwt/gsm gateway/gsm fwt etross