1. Simple to install / easy to maintain / Easy access to GSM networks
2. High sensitivity quad band industrial module for clear voice quality
3. Provide up to 30mA output current for payphone connection
4. 1 SIM Card / 2 SIM Cards / 3 SIM Cards available
5. Multi-working modes programmable
6. Support PSTN (optional)
7. With backlight LCD for parameters and information display optional
8. Least Cost Routing, GSM prefix number can be programmed
9. Auto-prefix of Local area code programmable
10. Display/hide Caller ID can be set
11. Support polarity reversal signal for GSM metering
12. RMS (remote management system) feature (optional)
13. Network locking / BTS locking / SIM card PIN locking facility
14. Support extended accumulator battery for redundancy power supply