Meets ADA requirements for Emergency Phones:Can automatically light the "Call Connected" LED for the hearing impairedTransmits a unique location I.D. code or voice announcementGrade 2 Braille label for the visually impairedNon-volatile digital voice announcer with 16 seconds of voice memoryAdvanced call progress detectionHandsfree operationPhone line poweredNon-volatile memory (no batteries required)Marine grade 316 stainless steel prevents corrosion on stainless modelsDials up to 5 emergency numbersE-1600-20A and E-1600-52A dial up to 3 non-emergency βINFOβ numbersCycles through backup emergency and non-emergency numbers on busy or no-answerEnhanced Weather Protection (EWP), EWP products are designed to meet IP66 Ingress Protection RatingHangs up on CPC, silence, busy signal, dial tone, time-out or touch tone commandProgrammable to auto-answer on incoming callsRemotely programmableExtended temperature range (-15Β°F to 130Β°F)