Emergency Telephone Color Gray Material Stainless Steel Mounting Location Surface Product Type Emergency Call Boxes Features Gai-Tronics Red Alert(R) Auto-Dial Telephones are Designed to Provide Clear and Reliable Communications in Almost any Environment The Model 397-001ADFS is Considered to be Type 3R Weatherproof Compliant Maximum Operating Temperature 140 Degrees F Minimum Operating Temperature -4 Degrees F