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The DOORBIRD 423860506 is a multi-tenant module, model MTM18A, designed to expand the capacity of compatible DoorBird video intercom and access control systems for multi-unit residential and light commercial applications. This module allows a single door station to serve multiple tenants or units, routing calls and access requests to individual units within the building. It is typically installed by low-voltage technicians or security system integrators as part of a structured intercom deployment.
The MTM18A is suited for apartment buildings, condominiums, and multi-tenant commercial properties where a centralized entry point must communicate with multiple individual units. It integrates into DoorBird intercom infrastructure to support scalable tenant management without requiring separate door stations for each unit. Installers typically use this module when expanding an existing DoorBird installation or commissioning a new multi-unit system.
Designed as an OEM-style accessory for compatible DoorBird intercom and access control systems in multi-tenant configurations. Refer to DoorBird system documentation to confirm compatibility with your specific door station model before ordering.
Installation should be performed by a qualified low-voltage technician or licensed security system integrator. Disconnect power to the intercom system before installing or servicing this module. Follow all applicable local codes and manufacturer wiring diagrams during installation. Do not exceed the system's rated tenant capacity as specified in the DoorBird installation guide.
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