GSM 900/1800MHZ
"1. Easy to install, maintain;
2. Allow PIN code entering and reciprocal phone-card lock;
3. Provide optimized circuit directly connecting the exchange device;
4. Polarity reversal signal for metering;
5. 3.5dBi gain antenna;
6. Compatible to PABX;
7. Suitable for call termination of ISP;
8. Incoming call reminder, time display;
"