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Upgrade your existing intercom system master unit. This mounting frame is used to mount the master unit, in your existing intercom location - With out having to patch the wall.
Most older intercom stations are larger the the new units. With out the retro-fit mouting frame, you are required to patch the wall re-paint.... Now you simply replace the old intercom with this frame, insert the DMC3-4 intercom system, and you are ready to go.