... bands 2.Voice and message alert; 3.5 group phone + room NO. 4.3 wired + 16 wireless Details as below:wireless ... set alarm ON, OFF , Monitor , Output .8. 5 group phone + room number9. 1 group alarm monitor center phone.10. 2 group ... *6 DC7.2VSiren Volume110dBFor occasions:house,shop, bank,office, computer room, dock,street lamp,billboard,farm, garage, warehouse, orchard, factory floor ...