FWT GSM - 4 Port

FWT GSM - 4 Port SIM card: Support 3V/ 1.8 V ( adaptive) G-SIM card - Phone interface: DTMF line interface ( RJ-11 phone interface) On-hook voltage: 45V Off-hook current: 30 mA/ 41mA Dialing tone frequency: 450 Hz - Antenna interface: antenna gain > 3.5 DB Sensitivity < -104 DBM Antenna transmission power: < 3 W Impedance: 50 ohm. - Series interface: RS-232 ( Use the appointed data cable) - Working environment: Operation temperature: -20 ~ 60 Operation humidity: 45% ~ 95% Store temperature: -20 ~ 60 Atmosphere pressure86 ~ 106 Kpa Environment noise< 60dB