VIKING PB-3 EMERGENCY PHONE PANIC BUTTON W/MESSAGEAutomatic Noise Canceling (ANC) feature for clear audio in noisy environmentsNonvolatile digital voice announcer with 16 seconds of voice memoryDiscreet compact designBuiltin microphone for silent monitoringAdvanced call progress detectionHandsfree operationPhone line poweredNonvolatile memory (no batteries required) Dials up to 5 emergency numbersCycles through backup phone numbers on busy or noanswerHangs up on CPC, silence, busy signal, dial tone or timeoutProgrammable to autoanswer on incoming callsOptional ID announcementRemotely programmableExtended temperature range (15°F to 130°F)Central Station Monitoring capability (dials 2 numbers) Optional PB100 Polling System available (DOD 232) Optional BLK4EWP strobe light kit available (DOD 654) Optional LC6 Six Port Concentrator available (DOD 245) Also available with VoIP interface, see PB3IP for more information (DOD 241)