SMART INDUSTRIAL TELEPHONE MODEL-WMHS-III ID: 1) Fully Line powered. 24 – 56 VDC 2) INDOOR WALL / DESKTOP MODEL 3) One Piece Weatherproof keypad. 4) ABS enclosure. 5) Industrial ABS handset. 6)A Service Temperature Range from 0 to +60 o C. 7)Environment Protected. 8)10 Memory Location. 9)Noise Cancelling Microphone.