Features: 1. Dual-net (GSM&PSTN) for double protection. 2. Built-in GSM Module optional. 3. Built-in antenna of panel, PIR detector & door sensor. 4. Multi-user mode: each user can operate preset zones independently. 5. Mono-user mode: away arm / home arm the whole system. 6. Menu operation and audio guidance. 7. Multiple access codes for different operation authority. 8. 4 wired + 16 wireless zones (48 detectors). 9. Two timers for diffferent schedule. 10. Support 8 phone numbers. 11. Support CID.