VIKING PB-3-IP VOIP EMERGENCY PHONE PANIC BUTTON W/USERDiscreet compact designBuiltin microphone for silent monitoringAutomatic polling and programming software included2 Amp relay contacts for SL2 strobe light control, etc. SIP compliant (see DOD 944) for list of compatible phone systems and cloud providersOutbound Proxy, Authentication ID, Peer to Peer, VLAN TaggingPoE powered (class 1, <4 Watts)Automatic Noise Canceling (ANC) feature for proper operation in noisy areasVoIP eliminates the need for Push to Talk modeNetwork downloadable firmwareNonvolatile digital voice announcer with 28 seconds of voice memoryHandsfree operationDials up to 5 emergency numbersCycles through backup phone numbers on busy or noanswerHangs up on busy signal, timeout or touch tone commandExtended temperature range (40°F to 140°F)Optional PB100 Polling System available (DOD 232) Optional SL2 or BLK4EWP strobe light kit available (DOD 242/654)Diagnostics for testing microphone, speaker, and relayAlso available with analog telecom interface, see PB3 for more information (DOD 239)