DoorKing 1837 90 Series telephone entry and access control system

DoorKing's 1837 90 Series telephone entry and access control system stores up to 3,000 phone numbers and 8,000 device codes and can be expanded to control up to 48 wired access points with optional Tracker Expansion boards (up to 24 wirelessly). The 90 Series housing offers a streamlined look, has enhanced locking and weather sealing and provides easy internal installation of optional components such as a card reader, LCD heater and TCP/IP adapter for a direct internet connection.