Main Features: 1. Bulit-in GSM 850/900/1800/1900MHz. 2. With color LCD display & keyboard. 3. Support site monitoring & two-way communication functions. 4. Support multi-ways arm/disarm. 5. Can define the alarm zones. 6. External AC power failure alarm. 7. Host with tamper alarm function. 8. Bulit-in backup lithium battery(800 MaH). 9. With 1 wireless SOS zone, 1 fire alarm zone, 24 wireless alarm zones, one external power failure alarm, 2 wired alarm zones. Dimension:170(L)*118(W)*40(H)mm Weight: 2.5kg/pcs.