- Automatic Noise Canceling (ANC) feature for clear audio in noisy environments- Non-volatile digital voice announcer with 16 seconds of voice memory- Discreet compact design- Built-in microphone for silent monitoring- Advanced call progress detection- Handsfree operation- Phone line powered- Non-volatile memory (no batteries required)- Dials up to 5 emergency numbers- Cycles through backup phone numbers on busy or no-answer- Hangs up on CPC, silence, busy signal, dial tone or time-out- Programmable to auto-answer on incoming calls- Optional ID announcement- Remotely programmable- Extended temperature range (-15°F to 130°F)- Central Station Monitoring capability (dials 2 numbers)- Optional PB-100 Polling System available (DOD 232)- Optional BLK-4-EWP strobe light kit available (DOD 654)- Optional LC-6 Six Port Concentrator available (DOD 245)- Also available with VoIP interface, see PB-3-IP for more information (DOD 241)