Features:
- Quartic-band Industrial module
- Microphone volume adjustable
- Supplies reversal polarity signal
- USB port
- Mothball batteries
- Net lock,card lock or net and card lock reciprocally
- Preset local prefix,IP access number:follow traditional dial plan,system adds local prefix and IP access number automatically
- GPRS modem ,surfs to the internet (Optional)
- Extent to maximum 2 common telephone sets
- Connect to toll collector(Optional)
- Frequency range:GSM850/900/1800/1900MHz
- Power:110～240V AC,9V DC 50/60Hz
- Working temperature:0℃~+50℃
- Relative humidity:10%～95%
- Atmosphere Pressure:86～106Kpa