Emergency Telephone Color Silver Includes 12-Button Braille Keypad Call Push Button Emergency Push Button Material Stainless Steel Mounting Location Surface Operating Voltage 24V DC Product Type Emergency Call Boxes Features Real-Time Alarm Reporting Maximum Operating Temperature 131 Degrees F Minimum Operating Temperature -4 Degrees F Overall Depth 2 1/2 in Overall Height 11 7/8 in Overall Width 8 1/4 in Standards FCC CRF 47 Part 15 UL/CSA