DoorKing 1837-080 80 Series Surface Mount Telephone Entry Access Control System.  The model 1837 is an ideal telephone entry and access control system that is suited for a wide variety of applications. The built-in electronic directory and easy to use Remote Account Manager software for Windows make it a complete all-in one compact unit. The system can expand to control up to 16 entry points and supports elevator control.

Features

• 3,000 Phone Numbers / 3,000 Entry Codes / 8,000 Device Codes
• Control up to 48 additional entry points
• PC Programmable
• 3 Relays / 2 Wiegand Inputs
• Eight line LCD display
• Full duplex voice communication
• Elevator Control
  Cellular, Internet, or POTS Connections